RHOAIENG-19036: chore(gha): fix workflow_dispatch invocation

Previously, triggering the GitHub action manually would not build the image, and so the tests would then fail.

The cause is that we do different build commands depending whether it's builting on push, on pr, or on schedule, and for manual trigger nothing was defined.

Author: jiridanek

.github/workflows/build-notebooks-TEMPLATE.yaml

@@ -237,17 +237,19 @@ jobs:
       # region Image build
 
       # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#push
-      - name: "push|schedule: make ${{ inputs.target }}"
+      # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request
+
+      - name: "push|schedule|workflow_dispatch: make ${{ inputs.target }}"
         run: |
           make ${{ inputs.target }}
-        if: ${{ fromJson(inputs.github).event_name == 'push' || fromJson(inputs.github).event_name == 'schedule' }}
+        if: ${{ fromJson(inputs.github).event_name == 'push' ||
+          fromJson(inputs.github).event_name == 'schedule' ||
+          fromJson(inputs.github).event_name == 'workflow_dispatch' }}
         env:
           IMAGE_TAG: "${{ steps.calculated_vars.outputs.IMAGE_TAG }}"
           CONTAINER_BUILD_CACHE_ARGS: "--cache-from ${{ env.CACHE }} --cache-to ${{ env.CACHE }}"
           # dependent images were already built and pushed, so just let podman pull it
           BUILD_DEPENDENT_IMAGES: "no"
-
-      # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request
       - name: "pull_request: make ${{ inputs.target }}"
         run: |
           make ${{ inputs.target }}