ci: build image for self hosted gh runner test

this workflow uses path filters and runs only when
files related to self hosted runner code changes

it then triggers the workflow for the  self hosted
runner test, making the workflow run only for file
changes in the self hosted runner modules

.github/workflows/build-img-ghrunner-test.yaml

@@ -0,0 +1,50 @@
+name: build-img-ghrunner-test
+
+on:
+  push:
+    branches: [ main ]
+    tags:
+      - '*'
+    paths:
+      - 'pkg/util/ghactions/*.go'
+      - '.github/workflows/build-img-ghrunner-test.yaml'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'pkg/util/ghactions/*.go'
+      - '.github/workflows/build-img-ghrunner-test.yaml'
+
+jobs:
+  build-mapt:
+    name: build-mapt
+    runs-on: ubuntu-24.04
+    steps:
+    - name: Prepare runner
+      shell: bash
+      run: |
+        sudo apt-get update && sudo apt-get install -y qemu-user-static
+
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Build image for PR
+      if: ${{ github.event_name == 'pull_request' }}
+      env:
+        IMG: ghcr.io/redhat-developer/mapt-img-ghrunner-test:pr-${{ github.event.number }}
+      shell: bash
+      run: |
+        make oci-build
+        make oci-save
+        echo ${IMG} > mapt-image
+
+    - name: Create image metadata
+      run: |
+        echo ${{ github.event_name }} > mapt-event
+        cat ./mapt-event
+
+    - name: Upload crc-builder
+      uses: actions/upload-artifact@v4
+      with:
+        name: mapt
+        path: mapt*
+