forks now detected in the premerge workflow. tested locally on upstre…

…am and fork using act.

.github/workflows/premerge.yml

@@ -20,7 +20,7 @@ jobs:
         distro: [rockylinux, ubuntu]
     env:
       REGISTRY: ghcr.io
-      BRANCH: ${{ github.event.inputs.branch || '' }}
+      BRANCH: ${{ github.event.inputs.branch || github.head_ref }}
     if: github.event.pull_request.draft == false
     steps:
     - name: Maximize build space
@@ -47,24 +47,31 @@ jobs:
     - uses: actions/checkout@v3
     - name: Define BRANCH, COMMIT and G_ACCOUNT in environment
       run: |
-        if [[ "${{ github.event.pull_request.head.repo.fork }}" == "true" ]]; then
-          # This means the PR is from a fork
-          echo "G_ACCOUNT=${{ github.event.pull_request.head.repo.owner.login }}" >> $GITHUB_ENV
+        echo "IS_FORK=${{ github.event.pull_request.head.repo.fork }}" >> $GITHUB_ENV
+        echo "FORK_OWNER=${{ github.event.pull_request.head.repo.owner.login }}" >> $GITHUB_ENV
+        echo "REPO_OWNER=${{ github.repository_owner }}" >> $GITHUB_ENV
+        echo "COMMIT_SHA=$(git rev-parse --short ${{ github.sha }})" >> $GITHUB_ENV
+
+    - name: Setup G_ACCOUNT based on fork status
+      run: |
+        if [ "$IS_FORK" = "true" ]; then
+          echo "This means the PR is from a fork"
+          G_ACCOUNT="$FORK_OWNER"
         else
-          # This means the PR is from the same repository
-          echo "G_ACCOUNT=${{ github.repository_owner }}" >> $GITHUB_ENV
+          echo "This means the PR is from the same repository"
+          G_ACCOUNT="$REPO_OWNER"
         fi
-        echo "BRANCH=${{ github.head_ref }}" >> $GITHUB_ENV
-        echo "COMMIT=$(git rev-parse --short "${{ github.sha }}")" >> $GITHUB_ENV
+        echo "G_ACCOUNT=$G_ACCOUNT" >> $GITHUB_ENV
+
     - name: Testing guild-deploy.sh (IO fork of libsodium)
       run: |
         docker build . \
           --file files/tests/pre-merge/${{ matrix.distro }}-guild-deploy.sh-l.containerfile \
           --compress \
-          --build-arg BRANCH=${{ env.BRANCH }} \
-          --build-arg COMMIT=${{ env.COMMIT }} \
-          --build-arg G_ACCOUNT=${{ env.G_ACCOUNT }} \
-          --tag ${{ env.REGISTRY }}/${{ env.G_ACCOUNT }}/pre-merge-${{ matrix.distro }}:guild-deploy-l_${{ env.COMMIT }}
+          --build-arg BRANCH=$BRANCH \
+          --build-arg COMMIT=$COMMIT_SHA \
+          --build-arg G_ACCOUNT=$G_ACCOUNT \
+          --tag $REGISTRY/$G_ACCOUNT/pre-merge-${{ matrix.distro }}:guild-deploy-l_$COMMIT_SHA
     - name: Get Image ID
       run: |
         PREMERGE_IMAGE_ID1=$(docker inspect ${{ env.REGISTRY }}/${{ env.G_ACCOUNT }}/pre-merge-${{ matrix.distro }}:guild-deploy-l_${{ env.COMMIT }} --format='{{.Id}}')