create rewrite-patches workflow

.github/workflows/maintenance-rewrite-kernel-patches.yml

@@ -0,0 +1,127 @@
+name: "Maintenance: Rewrite kernel patches"
+
+on:
+  workflow_dispatch:
+    inputs:
+      board:
+        description: "Board name (e.g. bananapim5, khadas-vim3)"
+        required: true
+        type: string
+      branch:
+        description: "Branch to use"
+        required: true
+        type: choice
+        options:
+          - legacy
+          - vendor
+          - current
+          - edge
+      whattodo:
+        description: "rewrite uboot or kernel patches"
+        required: true
+        type: choice
+        options:
+          - rewrite-kernel-patches
+          - rewrite-uboot-patches
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  rewrite-patches:
+    name: "Rewrite ${{ inputs.board }} (${{ inputs.branch }})"
+    runs-on: rewrite
+    steps:
+      - name: Update existing repository
+        run: |
+          # Clone or update the repository
+          if [ -d .git ]; then
+            # Repo exists: update it
+            git fetch origin
+            git reset --hard origin/${{ github.ref_name }}
+            git checkout ${{ github.ref_name }}
+            git pull origin ${{ github.ref_name }}
+          else
+            # No repo: clone it
+            git clone --filter=blob:none "https://github.com/${{ github.repository }}" .
+            git checkout ${{ github.ref_name }}
+          fi
+
+      - name: Run rewrite-kernel-patches
+        env:
+          BOARD: ${{ inputs.board }}
+          BRANCH: ${{ inputs.branch }}
+          WHATTODO: ${{ inputs.whattodo }}
+        run: |
+          ./compile.sh BOARD=$BOARD BRANCH=$BRANCH $WHATTODO KERNEL_GIT=shallow
+
+      - name: Check for changes
+        id: check_changes
+        run: |
+          set -euo pipefail
+          if git diff --quiet; then
+            echo "has_changes=false" >> "$GITHUB_OUTPUT"
+            echo "::notice::No changes detected after rewrite-kernel-patches"
+          else
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+            echo "::notice::Changes detected after rewrite-kernel-patches - PR will be created"
+          fi
+
+      - name: Build PR body
+        id: build_pr_body
+        if: steps.check_changes.outputs.has_changes == 'true'
+        run: |
+          set -euo pipefail
+
+          # Per-file stats
+          tmp_stats=$(mktemp)
+          tmp_body=$(mktemp)
+          git diff --numstat > "$tmp_stats" || true
+
+          total_add=0; total_del=0; files=0
+          {
+            echo "| File | + | - | Δ |"
+            echo "|---|---:|---:|---:|"
+            while IFS=$'\t' read -r add del path; do
+              [[ -z "${path:-}" ]] && continue
+              [[ "$add" =~ ^[0-9]+$ ]] || add=0
+              [[ "$del" =~ ^[0-9]+$ ]] || del=0
+              delta=$(( add - del ))
+              total_add=$(( total_add + add ))
+              total_del=$(( total_del + del ))
+              files=$(( files + 1 ))
+              path_esc="${path//|/\\|}"
+              printf "| %s | %d | %d | %d |\n" "$path_esc" "$add" "$del" "$delta"
+            done < "$tmp_stats"
+            echo
+            printf "**Files:** %d  •  **Lines:** +%d / -%d  (Δ %d)\n" "$files" "$total_add" "$total_del" "$(( total_add - total_del ))"
+          } > "$tmp_body"
+
+          echo "pr_body_path=$tmp_body" >> "$GITHUB_OUTPUT"
+
+      - name: Open / Update PR
+        id: create_pr
+        if: steps.check_changes.outputs.has_changes == 'true'
+        uses: peter-evans/create-pull-request@v8
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: rewrite-patches/${{ inputs.board }}-${{ inputs.branch }}
+          delete-branch: true
+          base: main
+          title: "`[${{ inputs.branch }}]` kernel patches rewrite for `${{ inputs.board }}`"
+          commit-message: "[${{ inputs.branch }}] kernel patches rewrite for ${{ inputs.board }}"
+          body-path: ${{ steps.build_pr_body.outputs.pr_body_path }}
+          labels: |
+            Needs review
+
+      - name: Cleanup temp files
+        if: steps.build_pr_body.outputs.pr_body_path != ''
+        run: |
+          rm -f "${{ steps.build_pr_body.outputs.pr_body_path }}" || true
+
+      - name: Reset working directory for next run
+        if: always()
+        run: |
+          git reset --hard HEAD
+          git clean -fd