.github/workflows: Add the unit and verify workflows

Introduce two additional GH action workflows that match the existing
prow-based unit/verify jobs, with the intention of migrating off prow
entirely for master/4.8+ branch(es).

Signed-off-by: timflannagan <[email protected]>

Author: timflannagan

.github/workflows/unit.yml

@@ -0,0 +1,25 @@
+name: unit
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    paths:
+      - '**'
+      - '!doc/**'
+jobs:
+  unit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '~1.16'
+      - name: Install Kubebuilder
+        run: |
+          os=$(go env GOOS)
+          arch=$(go env GOARCH)
+          curl -L https://go.kubebuilder.io/dl/2.3.1/${os}/${arch} | tar -xz -C /tmp/
+          sudo mv /tmp/kubebuilder_2.3.1_${os}_${arch} /usr/local/kubebuilder
+      - name: Run unit tests
+        run: make unit

.github/workflows/verify.yml

@@ -0,0 +1,25 @@
+name: verify
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    paths:
+      - '**'
+      - '!doc/**'
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '~1.16'
+
+        # Note(tflannag): We need to explicitly setup the GOPATH as the generate-internal-groups.sh
+        # codegen script still relies on $GOPATH being set and will return an error otherwise.
+        # The setup-go action does not set this value for us: https://github.com/actions/setup-go/issues/14.
+      - name: Run the verify target
+        run: |
+          export GOPATH=$(go env GOPATH)
+          make verify