Add Github Actions workflow to build on top of the Steam Linux Runtime

* Add reusable Build workflow to build proton
* Add Release workflow to build and release proton when a release is published
* Add Development workflow with manual dispatch only

.github/workflows/build.yml

@@ -0,0 +1,55 @@
+name: Build
+
+on:
+  workflow_call:
+    inputs:
+      name:
+        required: true
+        type: string
+
+jobs:
+  proton:
+    name: ${{ inputs.name }}
+    runs-on: ubuntu-latest
+    steps:
+    - name: Prepare host
+      run: sudo apt update && sudo apt-get install -y ccache fontforge-nox
+
+    - name: Download cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.ccache
+        key: ccache-proton-${{ github.run_id }}
+        restore-keys: |
+          ccache-proton
+
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+        fetch-tags: true
+        submodules: recursive
+
+    - name: Patch
+      run: |
+        mkdir ./build
+
+    - name: Configure
+      working-directory: ./build
+      run: ../configure.sh --build-name=${{ inputs.name }} --enable-ccache --container-engine=docker
+
+    - name: Make ${{ inputs.name }}
+      working-directory: ./build
+      run: make -j3 redist
+
+    - name: Upload artifact ${{ inputs.name }}.tar.gz
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ inputs.name }}.tar.gz
+        path: ./build/${{ inputs.name }}.tar.gz
+
+    - name: Upload artifact ${{ inputs.name }}.sha512sum
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ inputs.name }}.sha512sum
+        path: ./build/${{ inputs.name }}.sha512sum

.github/workflows/devel.yml

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+name: Development
+
+on:
+  workflow_dispatch:
+
+jobs:
+  version:
+    name: Version
+    runs-on: ubuntu-latest
+    outputs:
+      tag_abbrev: ${{ steps.version.outputs.tag_abbrev }}
+      tag_offset: ${{ steps.version.outputs.tag_offset }}
+      sha_short: ${{ steps.version.outputs.sha_short }}
+      full_desc: ${{ steps.version.outputs.full_desc }}
+      branch: ${{ steps.version.outputs.branch }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+        fetch-tags: true
+
+    - name: Version
+      id: version
+      shell: bash
+      run: |
+        tag_abbrev=$(git describe --tags --abbrev=0)
+        echo "tag_abbrev=$tag_abbrev" >> $GITHUB_OUTPUT
+        echo "tag_offset=$(git rev-list $tag_abbrev..HEAD --count)" >> $GITHUB_OUTPUT
+        echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+        echo "full_desc=$(git describe --long --tags)" >> $GITHUB_OUTPUT
+        echo "branch=${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}}" >> $GITHUB_OUTPUT
+
+  build:
+    needs: version
+    name: Build
+    uses: ./.github/workflows/build.yml
+    with:
+      name: proton-${{ needs.version.outputs.full_desc }}-${{ needs.version.outputs.branch }}
+
+

.github/workflows/release.yml

@@ -0,0 +1,43 @@
+name: Release
+
+on:
+  release:
+    types: [ published ]
+
+jobs:
+  build:
+    name: Build
+    uses: ./.github/workflows/build.yml
+    with:
+      name: proton-${{ github.ref_name }}
+
+  release:
+    name: Release ${{ github.ref_name }}
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Download ${{ github.ref_name }}.tar.gz artifact
+      uses: actions/download-artifact@v3
+      with:
+        name: proton-${{ github.ref_name }}.tar.gz
+
+    - name: Download ${{ github.ref_name }}.sha512sum artifact
+      uses: actions/download-artifact@v3
+      with:
+        name: proton-${{ github.ref_name }}.sha512sum
+
+    - name: Upload ${{ github.ref_name }}.tar.gz to release
+      uses: svenstaro/[email protected]
+      with:
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+        tag: ${{ github.ref_name }}
+        file: proton-${{ github.ref_name }}.tar.gz
+        overwrite: false
+
+    - name: Upload ${{ github.ref_name }}.sha512sum to release
+      uses: svenstaro/[email protected]
+      with:
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+        tag: ${{ github.ref_name }}
+        file: proton-${{ github.ref_name }}.sha512sum
+        overwrite: false