refactor(cicd): replace github variables to get the base commit

also add a github_context env var to see all available variables

.gitea/workflows/deliver.yml

@@ -16,9 +16,17 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       changed: ${{ steps.set.outputs.changed }}
+
+
     steps:
       - uses: actions/checkout@v4
+
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
+
       - name: Detect changed packs
         id: set
         run: |
-          git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep '^assets/' | cut -d '/' -f2 | sort -u | jq -R -s -c 'split("\n")[:-1]'
+          git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | grep '^assets/' | cut -d '/' -f2 | sort -u | jq -R -s -c 'split("\n")[:-1]'