add a deployment/publish workflow for JSR.

.github/maintainers_guide.md

@@ -59,7 +59,7 @@ To create a new release:
 5. Make any adjustments to generated release notes to make sure they are accessible and approachable and that an end-user with little context about this project could still understand.
 6. Make sure "This is a pre-release" is _not_ checked.
 7. Publish the release by clicking the "Publish release" button!
-8. After a few minutes, the corresponding version will be available on https://deno.land/x/deno_slack_protocols.
+8. After a few minutes, the corresponding version will be available on https://deno.land/x/deno_slack_protocols and https://jsr.io/@slack/protocols.
 
 ## Workflow
 

.github/workflows/publish.yml

@@ -0,0 +1,16 @@
+name: Publish
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write # The OIDC ID token is used for authentication with JSR.    
+    steps:
+      - uses: actions/checkout@v4
+      - run: npx jsr publish