feat: add reusable tessl tile update workflow

.github/workflows/tessl-update.yml

@@ -0,0 +1,95 @@
+# Reusable workflow for keeping tessl tiles up to date.
+#
+# Runs `tessl update` on existing tiles and attempts to install tiles
+# listed in `.tessl/missing-tiles.txt` (one tile per line, # comments).
+# Successfully installed tiles are removed from the file automatically.
+# Opens a PR when changes are detected.
+#
+# Usage:
+#
+#   jobs:
+#     tessl:
+#       uses: codeflash-ai/github-workflows/.github/workflows/tessl-update.yml@main
+#       secrets:
+#         TESSL_TOKEN: ${{ secrets.TESSL_TOKEN }}
+
+name: Tessl Tile Updates
+
+on:
+  workflow_call:
+    secrets:
+      TESSL_TOKEN:
+        required: true
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  update-tiles:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: tesslio/setup-tessl@v2
+        with:
+          token: ${{ secrets.TESSL_TOKEN }}
+
+      - name: Update existing tiles
+        run: tessl update --yes
+
+      - name: Attempt to install missing tiles
+        run: |
+          missing_file=".tessl/missing-tiles.txt"
+          if [ ! -f "$missing_file" ]; then
+            echo "No missing tiles file found, skipping"
+            exit 0
+          fi
+          installed=()
+          while IFS= read -r tile || [ -n "$tile" ]; do
+            [ -z "$tile" ] && continue
+            [[ "$tile" == \#* ]] && continue
+            if tessl install --yes "$tile" 2>&1; then
+              installed+=("$tile")
+            fi
+          done < "$missing_file"
+          for tile in "${installed[@]}"; do
+            grep -v "^${tile}$" "$missing_file" > "$missing_file.tmp" && mv "$missing_file.tmp" "$missing_file"
+          done
+          if ! grep -qE '^[^#[:space:]]' "$missing_file" 2>/dev/null; then
+            rm "$missing_file"
+          fi
+
+      - name: Check for changes
+        id: changes
+        run: |
+          if git diff --quiet && git diff --cached --quiet; then
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create PR with updates
+        if: steps.changes.outputs.changed == 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          branch="chore/tessl-tile-updates-$(date +%Y%m%d)"
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git checkout -b "$branch"
+          git add tessl.json .tessl/
+          git commit -m "chore: update tessl tiles $(date +%Y-%m-%d)"
+          git push origin "$branch"
+          gh pr create \
+            --title "chore: update tessl tiles $(date +%Y-%m-%d)" \
+            --body "$(cat <<'EOF'
+## Summary
+
+Automated weekly tessl tile update:
+- Updated existing tiles to latest versions
+- Installed newly available tiles for project dependencies
+
+Generated by the **tessl-update** workflow.
+EOF
+          )"

README.md

@@ -109,6 +109,45 @@ jobs:
           DATABASE_URL: ${{ secrets.DATABASE_URL }}
 ```
 
+### `tessl-update.yml`
+
+Reusable workflow for keeping [tessl](https://tessl.io) tiles up to date. Updates existing tiles and attempts to install tiles listed in `.tessl/missing-tiles.txt`. Opens a PR when changes are detected.
+
+**Secrets:**
+
+| Secret | Required | Description |
+|---|---|---|
+| `TESSL_TOKEN` | Yes | Tessl API token for the workspace |
+
+**Missing tiles file (`.tessl/missing-tiles.txt`):**
+
+One tile per line, `#` comments supported. Successfully installed tiles are removed automatically. When the file is empty it gets deleted.
+
+```
+# PyPI tiles not yet in the registry
+tessl/pypi-tree-sitter-javascript
+tessl/pypi-ruff
+```
+
+**Example:**
+
+```yaml
+name: Tessl Tile Updates
+
+on:
+  schedule:
+    - cron: "0 9 * * 1"
+  workflow_dispatch:
+
+jobs:
+  tessl:
+    uses: codeflash-ai/github-workflows/.github/workflows/tessl-update.yml@main
+    secrets:
+      TESSL_TOKEN: ${{ secrets.TESSL_TOKEN }}
+```
+
+---
+
 ## Adding a new workflow
 
 1. Create a new `.yml` file in `.github/workflows/`