Add Github Actions CI

.github/workflows/build.yaml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  build-linux:
+    name: Build ${{ matrix.name }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: amd64
+            package: ""
+            cc: "gcc"
+          # TODO FIX arm - cross-compile
+          #- name: armv7
+          #  package: "-arm-linux-gnueabihf"
+          #  cc: "arm-linux-gnueabihf-gcc"
+          #- name: aarch64
+          #  package: "-aarch64-linux-gnu"
+          #  cc: "aarch64-linux-gnu-gcc"
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install deps
+        run: |
+          sudo apt update
+          sudo apt install -y make libsdl2-image-dev gcc-10${{ matrix.package }}
+      - name: Build
+        #env:
+        #  CFLAGS: "-I/usr/include/x86_64-linux-gnu/SDL2 -I/usr/include/x86_64-linux-gnu"
+        run: make -C src -j $(nproc) all CC=${{ matrix.cc }}-10  
+      - name: List
+        run: ls -l --color
+

.github/workflows/check-version.yaml

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+name: Check new version
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - 'src/config.h'
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Check version
+        id: config
+        run: |
+          VERSION=$(awk '/SDLPOP_VERSION/ {print $3}' src/config.h | head -n1 | tr -d '"')
+          echo "Version: $VERSION"
+          echo "::set-output name=version::$VERSION"
+      - uses: mukunku/tag-exists-action@v1.0.0
+        id: checkTag
+        with:
+          tag: v${{ steps.config.outputs.version }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Tag new version
+        if: ${{ steps.checkTag.outputs.exists != 'true' }}
+        uses: tvdias/github-tagger@v0.0.2
+        with:
+          # NOTE: May need PAT Token instead of Github Token.
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          tag: v${{ steps.config.outputs.version }}
+