revert action behavior

.github/workflows/build_prerelease.yml

@@ -1,12 +1,8 @@
 name: build_prerelease
 on:
-  workflow_dispatch:
-    inputs:
-      romfs_version:
-        type: string
-        description: 'The romfs version tag to use'
-        required: true
-        default: 'latest'
+  push:
+    branches:
+      - dev
 
 jobs:
   # bump the version and build the changelog
@@ -18,18 +14,16 @@ jobs:
       version: ${{ steps.push_tag.outputs.version }}
       changelog: ${{ steps.github_changelog.outputs.changelog }}
     steps:
+      # fail out if this is not a merge commit
+      - name: ensure merge
+        if: ${{ !startsWith(github.event.head_commit.message, 'Merge') }}
+        run: exit 1
+
       - name: checkout version
         uses: actions/checkout@v6.0.2
         with:
           fetch-depth: 0
 
-      # fail out if this is not a merge commit
-      - name: ensure merge
-        run: |
-          if ! git log -1 --pretty=%s | grep -q "^Merge"; then
-            exit 1
-          fi
-
       - name: get last merge
         id: last_merge
         shell: bash
@@ -174,16 +168,10 @@ jobs:
       uses: actions/checkout@v6.0.2
 
     - id: romfs_version
-      shell: bash
-      run: |
-        if [ "${{ inputs.romfs_version }}" = "latest" ]; then
-          RELEASE=$(curl -s -H "Authorization: Bearer ${{ secrets.RELEASE_TOKEN }}" \
-            https://api.github.com/repos/HDR-Development/romfs-release/releases/latest \
-            | python3 -c "import sys,json; print(json.load(sys.stdin)['tag_name'])")
-          echo "release=$RELEASE" >> $GITHUB_OUTPUT
-        else
-          echo "release=${{ inputs.romfs_version }}" >> $GITHUB_OUTPUT
-        fi
+      uses: pozetroninc/github-action-get-latest-release@master
+      with:
+        token: ${{ secrets.RELEASE_TOKEN }}
+        repository: HDR-Development/romfs-release
 
     - name: Download romfs
       id: get_romfs