escape quotes

.github/workflows/release.yml

@@ -25,10 +25,12 @@ on:
         description: "The branch to release from"
         type: string
         required: true
+        default: "er/playground"
       version_number:
         description: "The release version number (i.e. 1.0.0b1)"
         type: string
         required: true
+        default: "1.7.12"
       test_run:
         description: "Test run (Publish release as draft)"
         type: boolean
@@ -195,9 +197,9 @@ jobs:
         id: determine-docker-package
         run: |
           if [ ${{ steps.semver.outputs.minor }} -ge 8 ]; then
-            json_output={\"package":\["dbt-core"]}
+            json_output={\"package\":[\"dbt-core\"]}
           else
-            json_output={\"package":\["dbt-core",\"dbt-postgres"]}
+            json_output={\"package\":[\"dbt-core\",\"dbt-postgres\"]}
           fi
           echo "matrix=$json_output" >> $GITHUB_OUTPUT