Generate dockerfile in GHA

.github/workflows/generateDockerLayer.yml

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+name: Generate Docker Layer
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - v*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Extract DOCKER_TAG using tag name
+      if: startsWith(github.ref, 'refs/tags/')
+      run: |
+        echo "DOCKER_TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+    
+    - name: Use default DOCKER_TAG
+      if: startsWith(github.ref, 'refs/tags/') != true
+      run: |
+        echo "DOCKER_TAG=latest" >> $GITHUB_ENV
+      
+    - name: Login to Github registry
+      uses: docker/login-action@v1 
+      with:
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+        registry: ghcr.io
+
+    - uses: docker/build-push-action@v2
+      with:
+        push: true
+        tags: ghcr.io/${{ github.repository }}:${{ env.DOCKER_TAG }}

Dockerfile

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+# First stage
+FROM alpine:latest
+
+COPY . /src
+
+
+RUN apk add build-base wget git bash cmake python3 glu-dev
+
+# Installing SDL2 from source because current SDL2 package in alpine
+# has some tricks that make PPSSPP compilation to fail
+ENV SDL_VERSION=2.0.20
+RUN wget https://github.com/libsdl-org/SDL/archive/refs/tags/release-${SDL_VERSION}.tar.gz && \
+    tar -xf release-${SDL_VERSION}.tar.gz && cd SDL-release-${SDL_VERSION} && mkdir build && cd build && \
+    cmake -DCMAKE_BUILD_TYPE=Release .. && \
+    make -j$(getconf _NPROCESSORS_ONLN) clean && \
+    make -j$(getconf _NPROCESSORS_ONLN) && \
+    make -j$(getconf _NPROCESSORS_ONLN) install
+
+RUN cd src/ffmpeg && ./linux_x86-64.sh
+RUN cd src && ./b.sh --headless
+
+# Second stage
+FROM alpine:latest
+
+# Install required dependencies to make headless to work
+RUN apk add --no-cache sdl2 libstdc++ glu-dev
+
+# Copy minimal things to make headless to work
+COPY --from=0 src/build/PPSSPPHeadless usr/local/bin/
+
+RUN PPSSPPHeadless || true