Add blog post about sbt-dependency-submission

blog/_posts/2022-07-18-secure-your-dependencies-on-github.md

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+---
+layout: blog-detail
+post-type: blog
+by: Adrien Piquerez, Scala Center
+title: Secure the Dependencies of your Scala Project on Github
+---
+
+We released [sbt-dependency-submission][sbt-dependency-submission], a GitHub action that submits the dependencies of sbt builds to the [GitHub Dependency submission API](https://docs.github.com/en/code-security/supply-chain-security/understanding-your-software-supply-chain/using-the-dependency-submission-api) (currently in beta).
+This action, once installed in a Github workflow, allows you to view the [Dependency graph](https://docs.github.com/en/code-security/supply-chain-security/understanding-your-software-supply-chain/about-the-dependency-graph) in Github and to receive regular security reports from [Dependabot](https://docs.github.com/en/code-security/dependabot/dependabot-alerts/about-dependabot-alerts).
+
+A similar action for the Mill build tool, the [mill-dependency-submission][mill-dependency-submission] action, developed by Chris Kipp, is also available.
+Other solutions are available for Maven and Gradle as well.
+
+The next sections explain the motivation behind this project, show how to get started, compare Dependabot and Scala Steward, and list similar solutions for other build tools.
+
+## GitHub Dependabot and the Scala ecosystem
+
+Last year, the [Log4j CVE](https://scala-lang.org/blog-detail/2021/12/16/state-of-log4j-in-scala-ecosystem.html) reminded us of the importance of staying alert to security vulnerabilities.
+Fixing all known vulnerabilities once does not make your project secure, since critical vulnerabilities can always be found and exploited in open source libraries, even the most widely used ones.
+Being able to identify new vulnerabilities and to respond to them quickly reduces the risk of exposure to its minimum.
+But the task can be time consuming, unless we automate it.
+
+GitHub Dependabot is an automation tool that helps us secure our projects.
+Its initial approach is to scan static configuration files such as POM files or package-lock.json files to extract the dependencies of a repository and cross reference them with a database of vulnerabilities.
+But some build definitions, such as build.sbt files, are programs that cannot be statically analyzed.
+A few weeks ago, GitHub released the beta version of the Dependency submission API, a REST API that we can use in CI workflows to submit complete snapshots of dependencies when they are resolved at build-time.
+
+As a large part of the Scala community uses GitHub to host their projects, we developed sbt-dependency-submission, a GitHub action that can extract the graphs of dependencies of sbt projects, for Dependabot to analyze them and report any vulnerability.
+With this tool, we hope to contribute to building a more secure Scala open source ecosystem.
+
+## Setting up the workflow
+
+Before installing the dependency submission action, you need to ensure that the `Dependency graph` view is enabled in the `Settings > Code security and analysis` tab of your GitHub repository.
+You should also consider enabling `Dependabot alerts`.
+
+![Dependency graph](/resources/img/blog/github/dependency-graph.jpg)
+
+To install the action, add a new workflow in the `.github/workflows` folder, with the following definition:
+
+```yaml
+# .github/workflows/dependency-graph.yml
+name: Update Dependency Graph
+
+on:
+  push:
+    branches:
+      - main # default branch of the project
+
+jobs:
+  update-graph:
+    name: Update Dependency Graph
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: scalacenter/sbt-dependency-submission@v2
+    with:
+      ## Optional: Define the working directory of your build.
+      ## It should contain the build.sbt file.
+ 	    working-directory: ‘./’
+```
+
+This default definition should work in many sbt builds out-of-the-box.
+Given a valid sbt build, the action installs an sbt plugin that will extract all transitive library dependencies from all subprojects on all Scala versions.
+
+For troubleshooting, please refer to the [documentation](https://github.com/marketplace/actions/sbt-dependency-submission) of the action.
+
+## Scala Steward and GitHub Dependabot
+
+[Scala Steward](https://github.com/scala-steward-org/scala-steward) is a tool that helps you keep the dependencies of your project up-to-date by opening pull requests on GitHub (and other hosting services).
+It is used in more than a thousand open-source repositories and many proprietary ones and contributes to a large extent to the security of the Scala ecosystem.
+
+Dependabot and Scala Steward can be used as complementary tools.
+Scala Steward, as a preventive tool, can help you keep your dependencies up-to-date, which reduces the risk of security vulnerabilities.
+Dependabot, as a monitoring tool, can notify you when a vulnerability is found, so that you can act quickly.
+
+Dependabot can also send PRs to update dependencies, but in static configuration files only.
+It can update the actions in your Github workflows, or the Maven dependencies in your POM files, but not the dependencies in the `build.sbt` or `build.sc` files.
+
+## Other supported build tools
+
+You can use Dependabot with other Scala-compatible build tools.
+
+### Maven
+
+Dependabot supports Maven through static analysis of POM files.
+You can enable the Dependency graph view and Dependabot in the `Settings > Code security and analysis` page.
+
+### Mill
+The [mill-dependency-submission][mill-dependency-submssion] action, developed by Chris Kipp, can extract the dependencies of a Mill build.
+
+To install it:
+ - Enable the `Dependency graph` view, and optionally the `Dependabot alerts`, in the `Settings > Code security and analysis` page of your repository.
+ - Add this workflow in you repository:
+
+```yaml
+# .github/workflows/dependency-graph.yml
+name: Update Dependency Graph
+
+on:
+  push:
+    branches:
+      - main # default branch of the project
+
+jobs:
+  update-graph:
+    name: Update Dependency Graph
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: coursier/cache-action@v6
+      - uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+      - uses: ckipp01/mill-dependency-submission@v1
+```
+### Gradle
+
+Gradle users can use the [gradle-dependency-submission][gradle-dependency-submission] action.
+
+## Summary
+
+In Github, it is now possible to use pre-made actions, like [sbt-dependency-submission][sbt-dependency-submission] or [mill-dependency-submission][mill-dependency-submission], to extract full graphs of dependencies at build time.
+This allows Dependabot to analyze the dependencies and publish regular reports of vulnerabilities.
+Only project administrators, organization owners and users with explicit access can see the Dependabot reports.
+
+The sbt-dependency-submission action is a fresh tool that relies on the beta Dependency submission API, but the cost of trying it is low and it will help you secure your sbt builds.
+Give it a try and report any bug at [scalacenter/sbt-dependency-submission](https://github.com/scalacenter/sbt-dependency-submission).
+
+[sbt-dependency-submission]: https://github.com/marketplace/actions/sbt-dependency-submission
+[mill-dependency-submission]: https://github.com/marketplace/actions/mill-dependency-submission
+[gradle-dependency-submission]: https://github.com/marketplace/actions/gradle-dependency-submission