Remove unnecessary build step from integration test workflow

Now that the development policy is to continuously package the project, and this policy is enforced by the CI workflow,
the action will always be pre-built, so building it again during the integration test workflow runs is pointless.

Author: per1234

.github/workflows/integration.yml

@@ -21,12 +21,6 @@ jobs:
       - name: Checkout local repository
         uses: actions/checkout@v2
 
-      - name: Build action
-        run: |
-          npm install
-          npm run build
-          npm run pack
-
       # Run the action using default values as much as possible.
       - name: Run action
         uses: ./ # Use the action from the local path.