Use expr

Author: krzema12

.github/workflows/end-to-end-tests.main.kts

@@ -206,7 +206,7 @@ workflow(
                 // TODO: fix in https://github.com/typesafegithub/github-workflows-kt/issues/1956
                 command = """
                     cat << EOF > actual
-                    $GREETING-$FIRST_NAME
+                    ${ expr { "$GREETING-$FIRST_NAME" } }
                     EOF
 
                     cat << EOF > expected

.github/workflows/end-to-end-tests.yaml

@@ -124,7 +124,7 @@ jobs:
         FIRST_NAME: 'Patrick'
       run: |-
         cat << EOF > actual
-        env.GREETING-env.FIRST_NAME
+        ${{ env.GREETING-env.FIRST_NAME }}
         EOF
 
         cat << EOF > expected