add github action

.github/workflows/ci.yml

@@ -0,0 +1,72 @@
+name: Continuous Integration
+
+on:
+  pull_request:
+    branches: ["*"]
+  push:
+    branches: ["main"]
+    tags: ["v*"]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+jobs:
+  build:
+    name: Build and Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout current branch (full)
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Setup Java
+        uses: actions/setup-java@v2
+        with:
+            distribution: adopt
+            java-version: 11
+
+      - name: Get mill version
+        run: echo "MILL_VERSION=$(cat .mill-version)" >> $GITHUB_ENV
+
+      - name: Setup Mill
+        uses: jodersky/setup-mill@master
+        with:
+          mill-version: ${{ env.MILL_VERSION }}
+
+      - name: Check formatting
+        run: mill -k --disable-ticker __.checkFormat
+
+      - name: Check headers
+        run: mill -k --disable-ticker __.headerCheck
+
+      - name: Compile
+        run: mill -k --disable-ticker __.compile
+
+      - name: Run tests
+        run: |
+          mill -k --disable-ticker __.test
+          mill -k --disable-ticker cli.run openapi-to-smithy --input modules/openapi/fullTests/testInputs modules/openapi/fullTests/testOutputs
+          mill -k --disable-ticker cli.run json-schema-to-smithy --input modules/json-schema/fullTests/testInputs modules/json-schema/fullTests/testOutputs
+          mill -k --disable-ticker proto.examples.compileScalaPB # trigger smithy-to-proto run
+
+      - name: Validate README.md
+        run: mill -k --disable-ticker readme-validator.validate
+
+      - name: Check for untracked changes
+        run: |
+          git status
+          ./scripts/check-dirty.sh
+
+      - name: Publish ${{ github.ref }}
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: mill -i io.kipp.mill.ci.release.ReleaseModule/publishAll
+        env:
+          PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
+          PGP_SECRET: ${{ secrets.PGP_SECRET }}
+          SONATYPE_PASSWORD: ${{ secrets.S01_SONATYPE_PASSWORD }}
+          SONATYPE_USERNAME: ${{ secrets.S01_SONATYPE_USERNAME }}

scripts/check-dirty.sh

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+diff=$(git diff --shortstat 2> /dev/null | tail -n1)
+if [ -n "$diff" ] ;
+then (echo "dirty"; exit 1)
+fi