GitHub Action for building AppImage (#6374)

Add AppImage build to GitHub workflow

.github/workflows/appimage.yml

@@ -0,0 +1,120 @@
+name: Build AppImage
+on:
+  push:
+    branches:
+      - dev
+  pull_request:
+    branches:
+      - dev
+  workflow_dispatch:
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Install dependencies
+        run: |
+          echo "Running apt update."
+          sudo apt update
+          echo "Installing dependencies with apt."
+          DEBIAN_FRONTEND=noninteractive sudo apt install -y cmake libgtk-3-dev libgtkmm-3.0-dev liblensfun-dev librsvg2-dev liblcms2-dev libfftw3-dev libiptcdata0-dev libtiff5-dev libcanberra-gtk3-dev liblensfun-bin
+      - name: Configure build
+        run: |
+          echo "Getting branch name."
+          BRANCH="$(git branch --show-current)"
+          echo "Branch name is '$BRANCH'."
+          echo "Making build directory."
+          mkdir build
+          echo "Changing working directory to the build directory."
+          cd build
+          echo "Running CMake configure."
+          cmake \
+            -DCMAKE_BUILD_TYPE="release"  \
+            -DCACHE_NAME_SUFFIX="5-$BRANCH-AppImage" \
+            -DPROC_TARGET_NUMBER="1" \
+            -DBUILD_BUNDLE="ON" \
+            -DBUNDLE_BASE_INSTALL_DIR="/" \
+            -DOPTION_OMP="ON" \
+            -DWITH_LTO="OFF" \
+            -DWITH_PROF="OFF" \
+            -DWITH_SAN="OFF" \
+            -DWITH_SYSTEM_KLT="OFF" \
+            -DCMAKE_INSTALL_PREFIX=/usr \
+            -DLENSFUNDBDIR="../share/lensfun/version_1" \
+            ..
+      - name: Build RawTherapee
+        working-directory: ./build
+        run: |
+          echo "Running make install."
+          make -j$(nproc) install DESTDIR=AppDir/usr/bin
+          echo "Moving usr/bin/share to usr/share."
+          mv AppDir/usr/bin/share AppDir/usr/
+      - name: Include Lensfun
+        run: |
+          echo "Updating Lensfun database."
+          lensfun-update-data
+          echo "Creating Lensfun directory in the build directory."
+          mkdir -p build/AppDir/usr/share/lensfun
+          echo "Copying Lensfun database to the build directory."
+          cp -R ~/.local/share/lensfun/updates/* build/AppDir/usr/share/lensfun/
+      - name: Download AppImage tools
+        working-directory: ./build
+        run: |
+          echo "Downloading linuxdeploy."
+          curl --location 'https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage' > linuxdeploy-x86_64.AppImage
+          echo "Downloading GTK plugin for linuxdeploy."
+          curl --location 'https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh' > linuxdeploy-plugin-gtk.sh
+          echo "Setting execute bit on all AppImage tools."
+          chmod u+x linuxdeploy-*
+      - name: Package AppImage
+        working-directory: ./build
+        run: |
+          echo "Getting RawTherapee version."
+          export VERSION="$(grep -m 1 '^Version: .*$' AboutThisBuild.txt | sed 's/^Version: \(.\+\)$/\1/')"
+          echo "Version is '$VERSION'."
+          echo "Generating AppImage file name."
+          FILTERED_VERSION="$(echo "$VERSION" | sed 's/[^A-z0-9_.-]//g')"
+          export OUTPUT="RawTherapee-$FILTERED_VERSION-x86_64.AppImage"
+          echo "AppImage file name will be '$OUTPUT'."
+          echo "Packaging AppImage."
+          ./linuxdeploy-x86_64.AppImage \
+            --appimage-extract-and-run \
+            --appdir AppDir \
+            --plugin gtk \
+            --output appimage
+          echo "Recording RawTherapee version."
+          echo "RT_VERSION=$VERSION" >> $GITHUB_ENV
+          echo "Recording AppImage file name."
+          echo "APPIMAGE_NAME=$OUTPUT" >> $GITHUB_ENV
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: ${{env.APPIMAGE_NAME}}
+          path: ${{github.workspace}}/build/${{env.APPIMAGE_NAME}}
+      - name: Prepare for publishing
+        run: |
+          echo "Setting dev AppImage file name."
+          APPIMAGE_DEV_NAME="RawTherapee-dev-x86_64.AppImage"
+          echo "dev AppImage file name is '$APPIMAGE_DEV_NAME'."
+          echo "Renaming dev AppImage."
+          cp "build/$APPIMAGE_NAME" "$APPIMAGE_DEV_NAME"
+          echo "Recording dev AppImage file name."
+          echo "APPIMAGE_DEV_NAME=$APPIMAGE_DEV_NAME" >> $GITHUB_ENV
+          echo "Setting dev AppImage version file name."
+          APPIMAGE_DEV_VERSION_NAME="RawTherapee-dev-x86_64-version.txt"
+          echo "dev AppImage version file name is '$APPIMAGE_DEV_VERSION_NAME'."
+          echo "Creating dev AppImage version file."
+          echo "$RT_VERSION" > "$APPIMAGE_DEV_VERSION_NAME"
+          echo "Recording dev AppImage version file name."
+          echo "APPIMAGE_DEV_VERSION_NAME=$APPIMAGE_DEV_VERSION_NAME" >> $GITHUB_ENV
+      - name: Publish artifacts
+        uses: softprops/action-gh-release@v1
+        if: ${{github.ref == 'refs/heads/dev'}}
+        with:
+          tag_name: nightly-github-actions
+          files: |
+            ${{env.APPIMAGE_DEV_NAME}}
+            ${{env.APPIMAGE_DEV_VERSION_NAME}}