add github actions (#4164)

.github/workflows/linux-builds.yml

@@ -0,0 +1,120 @@
+name: Build on Linux (Docker)
+
+on:
+  pull_request:
+    branches:
+      - master
+  release:
+    types:
+      - published
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        distro: # these names correspond to the files in .ci/$distro
+          - UbuntuFocal
+          - UbuntuBionic
+          - ArchLinux
+          - DebianBuster
+          - Fedora33
+        include:
+          - distro: UbuntuFocal
+            package: DEB
+            test: skip # UbuntuFocal has a broken qt for debug builds
+
+          - distro: UbuntuBionic
+            package: DEB
+
+          - distro: ArchLinux
+            package: skip # we are packaged in arch already
+            allow-failure: yes
+
+          - distro: DebianBuster
+            package: DEB
+
+          - distro: Fedora33
+            package: RPM
+            test: skip # Fedora is our slowest build
+
+    runs-on: ubuntu-latest
+
+    continue-on-error: ${{matrix.allow-failure == 'yes'}}
+
+    env:
+      NAME: ${{matrix.distro}}
+      CACHE: /tmp/${{matrix.distro}}-cache # ${{runner.temp}} does not work?
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Get cache timestamp
+        id: cache_timestamp
+        shell: bash
+        run: echo "::set-output name=timestamp::$(date -u '+%Y%m%d%H%M%S')"
+
+      - name: Restore cache
+        uses: actions/cache@v2
+        env:
+          timestamp: ${{steps.cache_timestamp.outputs.timestamp}}
+        with:
+          path: ${{env.CACHE}}
+          key: docker-${{matrix.distro}}-cache-${{env.timestamp}}
+          restore-keys: |
+            docker-${{matrix.distro}}-cache-
+
+      - name: Build ${{matrix.distro}} Docker image
+        shell: bash
+        run: |
+          source .ci/docker.sh --build
+          export BUILD_SCRIPT="./ccache-stats.sh"
+          echo "ccache --show-stats" >$BUILD_SCRIPT
+          RUN # show stats in container instead of build
+
+      - name: Build debug and test
+        if: matrix.test != 'skip'
+        shell: bash
+        run: |
+          source .ci/docker.sh
+          RUN --server --debug --test
+
+      - name: Build release package
+        if: matrix.package != 'skip'
+        id: build_package
+        shell: bash
+        run: |
+          source .ci/docker.sh
+          RUN --server --release --package ${{matrix.distro}} ${{matrix.package}}
+          file=$(cd build && echo Cockatrice-*.*)
+          echo "::set-output name=file::$file"
+
+      - name: Upload artifacts
+        if: matrix.package != 'skip'
+        uses: actions/upload-artifact@v2
+        with:
+          name: ${{matrix.distro}}-package
+          path: build/${{steps.build_package.outputs.file}}
+
+      - name: Get release upload url
+        if: matrix.package != 'skip' && startsWith(github.ref, 'refs/tags/')
+        id: get_url
+        shell: bash
+        env:
+          ref: "${{github.ref}}"
+          repo: "${{github.repository}}"
+        run: |
+          url="$(./.ci/get_github_upload_url.sh)"
+          echo "::set-output name=upload_url::$url"
+
+      - name: Upload release to GitHub
+        if: steps.get_url.outcome == 'success'
+        uses: actions/upload-release-asset@v1.0.2
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        with:
+          upload_url: ${{steps.get_url.outputs.upload_url}}
+          asset_path: build/${{steps.build_package.outputs.file}}
+          asset_name: ${{steps.build_package.outputs.file}}
+          asset_content_type: binary_package # required but arbitrary