chore: set pr title (#50)

## Motivation

<!-- List motivation and changes here -->

## Issues closed

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.github/workflows/set-pr-title.yml

@@ -0,0 +1,30 @@
+name: Set PR Title to First Commit Message
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  set-pr-title:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          # Fetches the entire commit history so that we can access the first commit
+          fetch-depth: 0
+
+      - name: Get first commit message
+        run: |
+          # Get the SHA of the first commit in the PR
+          FIRST_COMMIT_SHA=$(git log --reverse --format="%H" "${{ github.event.pull_request.base.sha }}..HEAD" | head -n 1)
+          # Get the message of the first commit in the PR
+          FIRST_COMMIT_MESSAGE=$(git log -n 1 --format=%B "$FIRST_COMMIT_SHA")
+          echo "FIRST_COMMIT_MESSAGE=$FIRST_COMMIT_MESSAGE" >> $GITHUB_ENV
+
+      - name: Update PR title
+        run: gh pr edit "$PR_NUMBER" --title "$FIRST_COMMIT_MESSAGE"
+        env:
+          FIRST_COMMIT_MESSAGE: ${{ env.FIRST_COMMIT_MESSAGE }}
+          GITHUB_TOKEN: ${{ secrets.PIXELASS_PAT_BLIBLA }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}