Make artifactName optional.

action.yml

@@ -15,5 +15,9 @@ inputs:
     description: This should be a token with access to the repository scoped in as a secret. This will be available in the GitHub runner environment by default as `secrets.GITHUB_TOKEN`.
     required: true
   artifactName:
-    description: The name of the artifact to be uploaded, for example `docs`. This will be used as the directory name within S3 for uploaded artifacts.
-    required: true
+    description: |
+      The name of the artifact to be uploaded, for example `docs`.
+      If supplied then it is used as the directory name within S3 for the uploaded artifacts, as well as within the GitHub deployment environment name.
+      If not supplied or supplied as an empty string then the artifacts are uploaded to S3 at root for this deployment context.
+    required: false
+    default: ''

src/index.ts

@@ -55,7 +55,7 @@ const ref = createRef(githubRef)
 
 const s3BucketName = 'sdk.ably.com';
 const sourcePath = path.resolve(core.getInput('sourcePath'));
-const artifactName = core.getInput('artifactName');
+const artifactName = core.getInput('artifactName').trim(); // empty string indicates no value, i.e. artifact name not specified
 
 let githubDeploymentRef: string;
 let s3KeyPrefix = `builds/${context.repo.owner}/${context.repo.repo}/`;
@@ -76,8 +76,11 @@ if (context.eventName === 'pull_request') {
     core.setFailed("Error: this action can only be ran on a pull_request, a push to the 'main' branch, or a push of a tag");
     process.exit(1);
 }
-s3KeyPrefix += ('/' + artifactName);
-githubEnvironmentName += ('/' + artifactName);
+
+if (artifactName.length > 0) {
+  s3KeyPrefix += ('/' + artifactName);
+  githubEnvironmentName += ('/' + artifactName);
+}
 
 core.debug(`S3 Key Prefix: ${s3KeyPrefix}`);
 core.debug(`GitHub Environment Name: ${githubEnvironmentName}`);