Another experiment.

.gitea/workflows/tryActions.yaml

@@ -31,3 +31,4 @@ jobs:
     - name: Use output
       run: |
         echo "Output current_version is ${{steps.set-output.outputs.current_version}}"
+        echo "Output current_version is ${{current_version}}"

action.yaml

@@ -8,6 +8,9 @@ inputs:
   start-version:
     description: The version number with wich to start.
     required: true
+  export-to:
+    description: To what env var to export the version number.
+    required: false
 outputs:
   current_version:
     description: The maximum currently downloadable version found.

index.js

@@ -68,7 +68,10 @@ async function main() {
   try {
     const url_pattern = core.getInput("url-pattern");
     const start_version = core.getInput("start-version");
-    const current_version = await increaseVersion(url_pattern, start_version);
+    const current_version = `${await increaseVersion(
+      url_pattern,
+      start_version,
+    )}`;
     const export_to = core.getInput("export-to");
     core.info(`The new version determend is ${current_version}`);
     core.exportVariable("current_version", `${current_version}`);