Add initial GitHub Actions CI

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: GitHub CI
+
+on:
+  pull_request:
+  push:
+  schedule:
+    - cron: 0 0 * * 0
+
+defaults:
+  run:
+    shell: 'bash -Eeuo pipefail -x {0}'
+
+jobs:
+
+  generate-jobs:
+    name: Generate Jobs
+    runs-on: ubuntu-latest
+    outputs:
+      strategy: ${{ steps.generate-jobs.outputs.strategy }}
+    steps:
+      - uses: actions/checkout@v2
+      - id: generate-jobs
+        name: Generate Jobs
+        run: |
+          export BASHBREW_NAMESPACE='tianon'
+          image="${GITHUB_REPOSITORY##*/}"
+          image="${image#docker-}"
+          export GITHUB_REPOSITORY="$image"
+          git clone --depth 1 https://github.com/docker-library/bashbrew.git -b master ~/bashbrew
+          strategy="$(~/bashbrew/scripts/github-actions/generate.sh)"
+          jq . <<<"$strategy" # sanity check / debugging aid
+          echo "::set-output name=strategy::$strategy"
+
+  test:
+    needs: generate-jobs
+    strategy: ${{ fromJson(needs.generate-jobs.outputs.strategy) }}
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Prepare Environment
+        run: ${{ matrix.runs.prepare }}
+      - name: Pull Dependencies
+        run: ${{ matrix.runs.pull }}
+      - name: Build ${{ matrix.name }}
+        run: ${{ matrix.runs.build }}
+      - name: History ${{ matrix.name }}
+        run: ${{ matrix.runs.history }}
+      - name: Test ${{ matrix.name }}
+        run: ${{ matrix.runs.test }}
+      - name: '"docker images"'
+        run: ${{ matrix.runs.images }}