First clone main and then fetch desired commit

.forgejo/workflows/generate-tarball.yml

@@ -21,7 +21,10 @@ jobs:
       - name: Environment setup
         run: apk add nodejs git zstd tar sed bash py3-httplib2
       - name: Getting depot_tools
-        run: git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git -b $DEPOT_TOOLS_VER --depth 1 ./
+        run: |
+          git clone --depth 1 https://chromium.googlesource.com/chromium/tools/depot_tools.git ./
+          git fetch --depth 1 origin $DEPOT_TOOLS_VER
+          git checkout $DEPOT_TOOLS_VER
       - name: Fetching webrtc
         run: |
           echo "solutions = [{'name': 'src','url': 'https://github.com/signalapp/webrtc.git@$_webrtcver',}]" > .gclient