Add workflow to bump build.func revision

.github/workflows/revision-bump.yml

@@ -0,0 +1,44 @@
+name: Bump build.func Revision
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - 'misc/*.func'
+      - 'misc/*.sh'
+
+jobs:
+  bump-revision:
+    runs-on: ubuntu-latest
+    if: github.event.head_commit.author.name != 'github-actions[bot]'
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Detect misc changes
+        id: changes
+        run: |
+          git diff --name-only HEAD^ HEAD > changed_files.txt
+          echo "changed=$(cat changed_files.txt)" >> $GITHUB_OUTPUT
+
+      - name: Bump Revision if needed
+        if: contains(steps.changes.outputs.changed, 'misc/') && !contains(steps.changes.outputs.changed, 'misc/build.func')
+        run: |
+          REV_FILE=".build-revision"
+          if [ ! -f "$REV_FILE" ]; then echo 0 > "$REV_FILE"; fi
+          REV_NUM=$(($(cat $REV_FILE) + 1))
+          echo $REV_NUM > $REV_FILE
+          SHORT_SHA=$(git rev-parse --short HEAD)
+          REV_STR="Revision: r${REV_NUM} (git-${SHORT_SHA})"
+          sed -i "s/^# Revision:.*/# $REV_STR/" misc/build.func
+          echo "REV_STR=$REV_STR" >> $GITHUB_ENV
+
+      - name: Commit & push revision
+        if: contains(steps.changes.outputs.changed, 'misc/') && !contains(steps.changes.outputs.changed, 'misc/build.func')
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add misc/build.func .build-revision
+          git commit -m "chore: bump build.func to $REV_STR"
+          git push