Sync-and-test V1

.github/workflows/ahunt-sync-next2.yml

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+name: Sync & Test - Next
+
+on:
+  schedule:
+    - cron: '23 3 * * *' # An arbitary time, once every day.
+  # Permits triggering for testing.  
+  workflow_dispatch:
+
+env:
+  workflow_destination_branch: upstream-next2
+  workflow_source_branch: next
+
+jobs:
+  sync-with-upstream:
+    runs-on: ubuntu-latest
+    outputs:
+      synced_changes: steps.sync.outputs.has_new_commits
+    steps:
+    - name: Checkout next
+      uses: actions/checkout@v2
+      with:
+        # token: can be added here if you want actions to run on push (by
+        # default, this step uses GITHUB_TOKEN, and therefore no actions are run on
+        # push). Also, using the default token means workflow changes are blocked,
+        # which simply forces you review and push workflow changes manually. (Yes,
+        # the latter means I'll need to manually trigger the asan/lsan/ubsan jobs
+        # after pushing whenever someone makes a workflow change.)
+        ref: ${{ env.workflow_destination_branch }}
+        fetch-depth: 0
+    - name: Pull upstream changes
+      id: sync
+      uses: aormsby/Fork-Sync-With-Upstream-action@v2.3
+      with:
+        upstream_repository: git/git
+        upstream_branch: ${{ env.workflow_source_branch }}
+        target_branch: ${{ env.workflow_destination_branch }}
+        git_pull_args: --ff-only
+    - name: Check for new commits
+      if: steps.sync.outputs.has_new_commits
+      run: echo "There were new commits."
+    - name: Timestamp
+      run: date
+
+  regular:
+    needs: sync-with-upstream
+    if: needs.sync-with-upstream.outputs.synced_changes
+    strategy:
+      fail-fast: false
+      matrix:
+        vector:
+        - jobname: linux-clang
+          name: Clang - ASAN
+          cc: clang
+          pool: ubuntu-latest
+          sanitize: address
+        - jobname: linux-clang
+          name: Clang - UBSAN
+          cc: clang
+          pool: ubuntu-latest
+          sanitize: undefined
+        - jobname: linux-clang
+          name: Clang - LSAN (subset of tests)
+          cc: clang
+          pool: ubuntu-latest
+          sanitize: leak,address
+          t: 'T="\$(wildcard t000[05]-*.sh)"'
+    name: ${{ matrix.vector.name }}
+    env:
+      CC: ${{ matrix.vector.cc }}
+      SANITIZE: ${{ matrix.vector.sanitize }}
+      jobname: ${{ matrix.vector.jobname }} # Is needed only for install-dependencies.sh
+    runs-on: ${{ matrix.vector.pool }}
+    steps:
+    - name: Checkout Branch
+      uses: actions/checkout@v2
+      with:
+        ref: ${{ env.workflow_destination_branch }}
+    - run: ci/install-dependencies.sh
+    # Cannot use ci/run-build-and-tests.sh because it runs multiple tests for
+    # jobname=linux-clang (which is unnecessary for the sanitizer runs - they're
+    # slow enough with just one run), but we need to use that jobname to get the
+    # right results from ci/install-dependencies.sh (hopefully I can add a
+    # wildcard to those scripts upstream eventually at which point the jobnames
+    # can be updated to something like linux-clang-asan, and
+    # run-build-and-tests.sh will run the tests only once).
+    - run: source ci/lib.sh && make && make ${{ matrix.vector.t }} test && check_unignored_build_artifacts
+    - run: ci/print-test-failures.sh
+      if: failure()