chore: create a pull request against our bcr fork on successful release

Author: kormide

.github/workflows/bcr-fork.yml

@@ -0,0 +1,50 @@
+# GitHub Actions workflow to create a pull request to our fork of the bazel central
+# registry after a successful release.
+
+name: BCR-FORK
+
+on:
+  release:
+    types: [published]
+
+env:
+  BCR_FORK: aspect-build/bazel-central-registry
+
+jobs:
+  bcr-pull-request:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "14"
+      - name: Get the tag
+        id: get_tag
+        run: echo ::set-output name=TAG::${GITHUB_REF#refs/tags/}
+      - name: Checkout this repo to access scripts
+        uses: actions/checkout@v3
+      - name: Checkout the released version of this repo
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ env.GITHUB_REF }}
+          path: project
+      - name: Checkout bcr
+        uses: actions/checkout@v3
+        with:
+          repository: ${{ env.BCR_FORK }}
+          path: bcr
+      - name: Create bcr entry
+        run: node .github/workflows/create-bcr-entry.mjs project bcr $GITHUB_REPOSITORY ${{ steps.get_tag.outputs.TAG }}
+      - name: Create Pull Request (BCR)
+        id: post_pr
+        uses: peter-evans/create-pull-request@v4
+        with:
+          token: ${{ secrets.DEREK_BCR_PAT }}
+          path: bcr
+          commit-message: ${{ github.repository }}@${{ steps.get_tag.outputs.TAG }}-fork
+          branch: ${{ github.repository }}@${{ steps.get_tag.outputs.TAG }}-fork
+          title: ${{ github.repository }}@${{ steps.get_tag.outputs.TAG }}
+          assignees: ${{ github.actor }}
+          body: |
+            [Automated] Publish ${{ github.repository }}@${{ steps.get_tag.outputs.TAG }}.
+      - name: Echo PR url
+        run: echo ${{ steps.post_pr.outputs.pull-request-url }}