ci: Add conventional PR title workflow

This workflow is only triggered on PRs for cert-tools (for now).

Author: Techassi

.github/workflows/pr_conventional-title.yaml

@@ -0,0 +1,26 @@
+---
+name: Conventional PR Title
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/pr_conventional-title.yaml"
+      - "rust/cert-tools"
+
+jobs:
+  check:
+    name: Ensure PR title is conventional
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+          submodules: recursive
+      - shell: bash
+        env:
+          PULL_REQUEST_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          echo "$PULL_REQUEST_TITLE" > pull_request_title
+      - uses: crate-ci/committed@dc6f20ddd899fe6d6f0402807884c0a4b3176b53 # v1.1.10
+        with:
+          args: --commit-file pull_request_title --config rust/cert-tools/committed.toml -vv --no-merge-commit

rust/cert-tools/committed.toml

@@ -0,0 +1,2 @@
+style = "conventional"
+allowed_scopes = ["cert-tools"]