misc(ci): fix workflow dispatch ref

Signed-off-by: Pavel Boldyrev <627562+bpg@users.noreply.github.com>

.github/workflows/test.yml

@@ -78,12 +78,9 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - name: Dump GitHub context
-        env:
-          GITHUB_CONTEXT: ${{ toJson(github) }}
-        run: echo "$GITHUB_CONTEXT"
-
       - name: Invoke acceptance tests workflow
         uses: benc-uk/workflow-dispatch@v1
         with:
           workflow: testacc.yml
+          ref: "main"
+          inputs: '{"ref": "${{ github.head_ref }}" }'