firefox: select test target in GitHub workflow

Add input arguments in the GitHub Workflow to be able to select
which repository to clone, and which branch to checkout to the build
and smoke tests.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

Author: OldManYellsAtCloud

.github/workflows/yocto_matrix.yml

@@ -1,6 +1,16 @@
 name: Firefox build- and smoke-test
 
-on: workflow_dispatch
+on:
+  workflow_dispatch:
+    inputs:
+      repository:
+        description: 'Repository to clone for the workflow'
+        required: true
+        default: 'OSSystems'
+      branch:
+        description: 'Branch to checkout for the workflow'
+        required: true
+        default: 'master'
 
 permissions:
   contents: read
@@ -30,8 +40,8 @@ jobs:
          mkdir -p /yocto/${{ matrix.yocto_version }}
          cd /yocto/${{ matrix.yocto_version }}
          rm -rf meta-browser meta-firefox-test
-         git clone $GITHUB_SERVER_URL/$GITHUB_REPOSITORY
-         git -C meta-browser checkout $GITHUB_HEAD_REF
+         git clone $GITHUB_SERVER_URL/${{ github.event.inputs.repository }}/meta-browser
+         git -C meta-browser checkout ${{ github.event.inputs.branch }}
          # clone the test repo
          git clone https://github.com/OldManYellsAtCloud/meta-firefox-test.git
          ./meta-firefox-test/scripts/build.sh ${{ matrix.yocto_version}} ${{ matrix.arch }} ${{ matrix.ff_version }} ${{ matrix.libc_flavour}}