github CI test runner, first attempt

Signed-off-by: Tim Bray <tbray@textuality.com>

.github/workflows/tests.yaml

@@ -0,0 +1,75 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  tests:
+    name: Tests and coverage
+    strategy:
+      matrix:
+        go-version: [ "1.19" ]
+        platform: [ "ubuntu-latest" ]
+        goflags: "-v -count=1 -json"
+        coveropts: "-coverprofile=coverage.txt -covermode=atomic"
+
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+        id: go
+
+      - name: Restore Go cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ matrix.go-version }}-${{ hashFiles('**/go.sum', 'testdata/**') }}
+          restore-keys: |
+            ${{ runner.os }}-go-${{ matrix.go-version }}-
+
+      - name: Install tparse
+        run: go install github.com/mfridman/tparse@latest
+
+      - name: Check for .codecov.yaml
+        id: codecov-enabled
+        uses: andstor/file-existence-action@latest
+        with:
+          files: .codecov.yaml
+
+      - name: Test
+        env:
+          COVER_OPTS: ${{ matrix.coveropts }}
+          GOFLAGS: ${{ matrix.goflags }}
+        run: go test $COVER_OPTS ./... | tparse -all -notests -format markdown >> $GITHUB_STEP_SUMMARY
+
+      - if: steps.codecov-enabled.outputs.files_exists == 'true'
+        name: Upload Codecov Report
+        uses: codecov/codecov-action@latest
+
+      - name: Verify git clean
+        shell: bash
+        run: |
+          if [[ -z "$(git status --porcelain)" ]]; then
+            echo "${{ github.repository }} up to date."
+          else
+            echo "${{ github.repository }} is dirty."
+            echo "::error:: $(git status)"
+            exit 1
+          fi
+
+
+
+
+