Add Workflow to automatically update .mergify.yml (#2180)

Also make minor updates to CI workflow

3 files changed, 62 insertions, 2 deletions

diff --git a/.github/configs/mergify_config.yml b/.github/configs/mergify_config.yml
new file mode 100644
index 00000000..90bf4ad5
--- /dev/null
+++ b/.github/configs/mergify_config.yml
@@ -0,0 +1,7 @@
+# Configuration for generating .mergify.yml
+conditions:
+  - status-success=all tests passed
+branches:
+  - 1.2.x
+  - 1.3.x
+  - 1.4.x
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4e0c8125..d04f7e05 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -30,7 +30,7 @@ jobs:
         with:
           java-version: adopt@1.8
       - name: Cache Scala
-        uses: coursier/cache-action@v5
+        uses: coursier/cache-action@v6
       - name: Check Formatting (Scala 2.12 only)
         if: startsWith(matrix.scala, '2.12')
         run: sbt ++${{ matrix.scala }} scalafmtCheckAll
@@ -95,7 +95,7 @@ jobs:
   # When adding new jobs, please add them to `needs` below
   all_tests_passed:
     name: "all tests passed"
-    needs: [test, equiv]
+    needs: [test, mill, equiv]
     runs-on: ubuntu-latest
     steps:
       - run: echo Success!
diff --git a/.github/workflows/update_mergify.yml b/.github/workflows/update_mergify.yml
new file mode 100644
index 00000000..d2067a42
--- /dev/null
+++ b/.github/workflows/update_mergify.yml
@@ -0,0 +1,53 @@
+name: Update .mergify.yml
+on:
+  schedule:
+    # Runs once an hour
+    - cron: "0 * * * *"
+
+jobs:
+  update-mergify:
+    name: Update .mergify.yml
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Checkout Chisel Repo Tools
+        uses: actions/checkout@v2
+        with:
+          repository:  ucb-bar/chisel-repo-tools
+          path: tools
+      - name: Setup Scala
+        uses: olafurpg/setup-scala@v10
+      - name: Install Ammonite
+        run: sudo sh -c '(echo "#!/usr/bin/env sh" && curl -L https://github.com/com-lihaoyi/Ammonite/releases/download/2.3.8/2.13-2.3.8) > /usr/local/bin/amm && chmod +x /usr/local/bin/amm'
+      - name: Cache Scala
+        uses: coursier/cache-action@v6
+      - name: Generate .mergify.yml
+        id: gen
+        run: |
+          ./tools/scripts/mergify.sc .github/configs/mergify_config.yml > .mergify.yml
+          diff=$(git diff -- .mergify.yml)
+          echo "::set-output name=diff::$diff"
+      - name: Commit and Push
+        if: ${{ steps.gen.outputs.diff }}
+        run: |
+          BRANCH="actions/workflows/update-mergify"
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git checkout -B $BRANCH
+          git add .mergify.yml
+          git commit -m "Update .mergify.yml"
+          git push --follow-tags --force --set-upstream origin $BRANCH
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Open/Update Pull Request
+        if: ${{ steps.gen.outputs.diff }}
+        uses: vsoch/pull-request-action@1.0.15
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PULL_REQUEST_FROM_BRANCH: actions/workflows/update-mergify
+          PULL_REQUEST_BRANCH: master
+          PULL_REQUEST_TITLE: "Update .mergify.yml"
+          PULL_REQUEST_BODY: "This is an automated pull request by \"Update .mergify.yml\" workflow"
+          PASS_IF_EXISTS: true
+