Set npm dist-tag to "next" for prerelease versions

.github/workflows/npm.yml

@@ -15,6 +15,9 @@ jobs:
         with:
           node-version: 'lts/*'
           registry-url: 'https://registry.npmjs.org'
+      - name: Set npm dist-tag to "next" if pre-release version
+        if: contains(github.ref_name, '-dev') || contains(github.ref_name, '-rc')
+        run: echo "DIST_TAG=next" >> $GITHUB_ENV
       - name: Set the webR CDN URL as the BASE_URL
         run: echo "BASE_URL=https://webr.r-wasm.org/${{ github.ref_name }}/" > "$HOME/.webr-config.mk"
       - name: Configure webR for flang

src/Makefile

@@ -59,9 +59,10 @@ package: $(PKG_DIST)/webr.mjs $(PKG_DIST)/vfs
 	npm pack
 	rm -rf "$(PKG_DIST)"
 
+DIST_TAG ?= "latest"
 .PHONY: publish
 publish: $(PKG_DIST)/webr.mjs $(PKG_DIST)/vfs
-	npm publish --access=public
+	npm publish --access=public --tag $(DIST_TAG)
 	rm -rf "$(PKG_DIST)"
 
 # Prepare the PKG_DIST directory for npm packaging and/or publication.