Enable HCDC

Reviewed-by: Tino Schreiber <tino.schreiber@t-systems.com>
Co-authored-by: Sebastian Gode <sebastian.gode@telekom.de>
Co-committed-by: Sebastian Gode <sebastian.gode@telekom.de>

.gitea/workflows/run-hcdc.yaml

@@ -1,22 +1,54 @@
 name: Run HCDC
 
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, reopened, synchronize, edited]
+  
+permissions:
+  contents: read
+  pull-requests: write
 
 jobs:
   run-hcdc:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout PR head
+      - name: Checkout PR head (same repo)
+        if: ${{ gitea.event.pull_request.head.repo.full_name == gitea.repository }}
         uses: https://github.com/actions/checkout@v4
         with:
-          repository: ${{ gitea.event.pull_request.head.repo.full_name }}
+          repository: ${{ gitea.repository }}
           ref: ${{ gitea.event.pull_request.head.ref }}
           fetch-depth: 0
+          persist-credentials: false
           token: ${{ gitea.token }}
 
+      - name: Create local branch for PR head (same repo)
+        if: ${{ gitea.event.pull_request.head.repo.full_name == gitea.repository }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          git checkout -B "${{ gitea.event.pull_request.head.ref }}" --no-track
+          git branch --show-current
+
+      - name: Checkout PR head (fork via PR ref)
+        if: ${{ gitea.event.pull_request.head.repo.full_name != gitea.repository }}
+        uses: https://github.com/actions/checkout@v4
+        with:
+          repository: ${{ gitea.repository }}
+          ref: refs/pull/${{ gitea.event.pull_request.number }}/head
+          fetch-depth: 0
+          persist-credentials: false
+          token: ${{ gitea.token }}
+
+      - name: Create local branch for PR head (fork)
+        if: ${{ gitea.event.pull_request.head.repo.full_name != gitea.repository }}
+        shell: bash
+        run: |
+          set -euo pipefail
+          git checkout -B "${{ gitea.event.pull_request.head.ref }}" --no-track
+          git branch --show-current
+
       - name: Checkout base
         uses: https://github.com/actions/checkout@v4
         with:
@@ -24,9 +56,9 @@ jobs:
           ref: ${{ gitea.event.pull_request.base.ref }}
           path: base
           fetch-depth: 0
+          persist-credentials: false
           token: ${{ gitea.token }}
 
-
       - name: Get OTC token
         id: otc
         uses: https://github.com/opentelekomcloud-infra/github-actions/.github/actions/get-otc-token@v1
@@ -46,7 +78,7 @@ jobs:
           python-version: "3.12"
     
       - name: Comment in case there's an error
-        if: failure()
+        if: ${{ failure() && steps.hcdc.outcome == 'failure' }}
         env:
           GITEA_URL: ${{ gitea.server_url }}
           REPO: ${{ gitea.repository }}