actions/example-pull-request: move is-forked to its own step

actions/example-pull-request/.forgejo/workflows/test.yml

@@ -24,15 +24,19 @@ jobs:
           forgejo-curl.sh --token "$GITHUB_TOKEN" login $GITHUB_SERVER_URL
           forgejo-curl.sh api_json $GITHUB_SERVER_URL/api/v1/user
 
+      - name: determine if the PR is from a fork
+        id: forked
+        run: |
+          if test ${{ github.event.pull_request.base.repo.full_name }} = ${{ github.event.pull_request.head.repo.full_name }} ; then
+            echo value=false >> $GITHUB_OUTPUT
+          else
+            echo value=true >> $GITHUB_OUTPUT
+          fi
+
       - name: secrets
         shell: bash
         run: |
           set -x
-          if test ${{ github.event.pull_request.base.repo.full_name }} = ${{ github.event.pull_request.head.repo.full_name }} ; then
-            forked=false
-          else
-            forked=true
-          fi
           case $GITHUB_EVENT_NAME in
             pull_request_target)
               #
@@ -41,7 +45,7 @@ jobs:
               test "${{ secrets.SECRET }}"
               ;;
             pull_request)
-              if $forked ; then
+              if ${{ steps.forked.outputs.value }} ; then
                 #
                 # PRs from forked repositories: no secrets
                 #
@@ -63,16 +67,11 @@ jobs:
         shell: bash
         run: |
           set -x
-          if test ${{ github.event.pull_request.base.repo.full_name }} = ${{ github.event.pull_request.head.repo.full_name }} ; then
-            forked=false
-          else
-            forked=true
-          fi
           function assert_fail_if_forked() {
             if "$@" ; then
-               ! $forked
+               ! ${{ steps.forked.outputs.value }}
             else
-               $forked
+               ${{ steps.forked.outputs.value }}
             fi
           }
           #
@@ -118,6 +117,6 @@ jobs:
         run: |
           d=/srv/example-pull-request/${{ github.event.pull_request.head.repo.owner.username }}/$GITHUB_EVENT_NAME/${{ github.event.action }}
           mkdir -p $d
-          cat > $d/event <<EOF
+          cat > $d/event <<'EOF'
           ${{ toJSON(github.event) }}
           EOF