Make the libretro branch only use stable releases, tag libretro releases

.github/actions/update_libretro.sh

@@ -0,0 +1,25 @@
+set -e
+
+LATEST=$(git tag --sort=-creatordate | grep "^v" | grep -v libretro | head -n 1)
+
+if [ $(git tag -l "$LATEST"-libretro) ]; then
+    echo "The libretro branch is already up-to-date"
+    exit 0
+fi
+
+echo "Building boot ROMs..."
+make -j bootroms
+mv build/bin/BootROMs BootROMs/prebuilt
+
+echo "Updating branch"
+git config --global --add --bool push.autoSetupRemote true
+git config --global user.name 'Libretro Updater'
+git config --global user.email '<>'
+
+git branch --delete libretro || true
+git checkout tags/$LATEST -b libretro
+
+git add BootROMs/prebuilt/*
+git commit -m "Update libretro branch to $LATEST"
+git tag "$LATEST"-libretro
+git push --force --tags

.github/workflows/libretro.yml

@@ -23,9 +23,6 @@ jobs:
         shell: bash
         run: |
           ./.github/actions/install_deps.sh ${{ matrix.os }}
-      - name: Build Boot ROMs
+      - name: Build Boot ROMs and Push
         run: |
-          make -j bootroms && mv build/bin/BootROMs BootROMs/prebuilt
-      - name: Push changes
-        run: |
-           git config --global --add --bool push.autoSetupRemote true && git config --global user.name 'Libretro Updater' &&  (git branch --delete libretro || true) && git checkout -b libretro && git config --global user.email '<>' && git add BootROMs/prebuilt/* && git commit -m 'Update prebuilt boot ROMs' && git push --force
+          ./.github/actions/update_libretro.sh