Add Github Actions to test and publish to Sonatype

.github/workflows/actions.yml

@@ -0,0 +1,49 @@
+name: ci
+
+on:
+  push:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Run tests
+        run: ./mill -i -j $(nproc) __.publishArtifacts __.test
+
+  publish-sonatype:
+    if: github.repository == 'com-lihaoyi/sourcecode' && contains(github.ref, 'refs/tags/')
+    needs: test
+    runs-on: ubuntu-latest
+    env:
+      SONATYPE_PGP_PRIVATE_KEY: ${{ secrets.SONATYPE_PGP_PRIVATE_KEY }}
+      SONATYPE_PGP_PRIVATE_KEY_PASSWORD: ${{ secrets.SONATYPE_PGP_PRIVATE_KEY_PASSWORD }}
+      SONATYPE_USER: ${{ secrets.SONATYPE_USER }}
+      SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
+      LANG: "en_US.UTF-8"
+      LC_MESSAGES: "en_US.UTF-8"
+      LC_ALL: "en_US.UTF-8"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Publish to Maven Central
+        run: |
+          if [[ $(git tag --points-at HEAD) != '' ]]; then
+            echo "$SONATYPE_PGP_PRIVATE_KEY" | base64 --decode | gpg --import
+            ./mill -i mill.scalalib.PublishModule/publishAll \
+              --sonatypeCreds $SONATYPE_USER:$SONATYPE_PASSWORD \
+              --gpgArgs --passphrase=$SONATYPE_PGP_PRIVATE_KEY_PASSWORD,--no-tty,--pinentry-mode,loopback,--batch,--yes,-a,-b \
+              --publishArtifacts __.publishArtifacts \
+              --readTimeout 600000 \
+              --awaitTimeout 600000 \
+              --release true \
+              --signed true
+          fi

build.sc

@@ -1,4 +1,6 @@
 import mill._, scalalib._, scalajslib._, scalanativelib._, publish._
+import $ivy.`de.tototec::de.tobiasroeser.mill.vcs.version_mill0.9:0.1.1`
+import de.tobiasroeser.mill.vcs.version.VcsVersion
 
 val dottyVersions = sys.props.get("dottyVersion").toList
 
@@ -18,7 +20,7 @@ val scalaNativeVersions = for {
 trait SourcecodeModule extends PublishModule {
   def artifactName = "sourcecode"
 
-  def publishVersion = "0.2.3"
+  def publishVersion = VcsVersion.vcsState().format()
 
   def pomSettings = PomSettings(
     description = artifactName(),