introduce os specific instructions to install FFmpeg in GitHub workflow

Author: rob93c

.github/workflows/unit-test.yml

@@ -23,11 +23,39 @@ jobs:
       - name: Checkout code changes
         uses: actions/checkout@v6
 
-      - name: Setup FFmpeg
-        uses: FedericoCarboni/setup-ffmpeg@v3
-        with:
-          # bump: ffmpeg-ci /ffmpeg-version: '([\d.]+)'/ docker:mwader/static-ffmpeg|~7.0
-          ffmpeg-version: '7.0.2'
+      - name: Install FFmpeg
+        shell: bash
+        run: |
+          set -euo pipefail
+          # bump: ffmpeg-ci /ffmpeg-version: '([\d.]+)'/ docker:mwader/static-ffmpeg|~8.0
+          FF_VERSION="8.0.1"
+          INSTALL_DIR="$HOME/ffmpeg"
+          mkdir -p "$INSTALL_DIR"
+
+          if [[ "${{ runner.os }}" == "Linux" ]]; then
+            docker pull mwader/static-ffmpeg:$FF_VERSION
+            CID=$(docker create mwader/static-ffmpeg:$FF_VERSION)
+            docker cp "$CID:/ffmpeg" "$INSTALL_DIR/ffmpeg"
+            docker cp "$CID:/ffprobe" "$INSTALL_DIR/ffprobe"
+            docker rm "$CID"
+            chmod +x "$INSTALL_DIR/"*
+
+          elif [[ "${{ runner.os }}" == "macOS" ]]; then
+            curl -L https://evermeet.cx/ffmpeg/ffmpeg-$FF_VERSION.zip -o ffmpeg.zip
+            unzip ffmpeg.zip
+            mv ffmpeg "$INSTALL_DIR/ffmpeg"
+            curl -L https://evermeet.cx/ffmpeg/ffprobe-$FF_VERSION.zip -o ffprobe.zip
+            unzip ffprobe.zip
+            mv ffprobe "$INSTALL_DIR/ffprobe"
+            chmod +x "$INSTALL_DIR/"*
+
+          elif [[ "${{ runner.os }}" == "Windows" ]]; then
+            curl -L https://www.gyan.dev/ffmpeg/builds/packages/ffmpeg-$FF_VERSION-essentials_build.zip -o ffmpeg.zip
+            unzip ffmpeg.zip
+            mv ffmpeg-*/bin/* "$INSTALL_DIR/"
+          fi
+
+          echo "$INSTALL_DIR" >> "$GITHUB_PATH"
 
       - name: Setup Java
         uses: actions/setup-java@v5