Create github actions workflow for snapshot releases

.changeset/config.json

@@ -13,6 +13,10 @@
         "version": false,
         "tag": false
     },
+    "snapshot": {
+        "useCalculatedVersion": true,
+        "prereleaseTemplate": "{tag}.{datetime}"
+    },
     "___experimentalUnsafeOptions_WILL_CHANGE_IN_PATCH": {
         "onlyUpdatePeerDependentsWhenOutOfRange": true
     }

.github/workflows/publish-snapshot.yml

@@ -0,0 +1,38 @@
+name: Publish snapshot
+on:
+  workflow_dispatch:
+jobs:
+  build_packages:
+    name: "Build and publish"
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install
+        uses: ./.github/actions/install
+
+      # Bumps versions in package.json (see https://github.com/changesets/changesets/blob/main/docs/snapshot-releases.md)
+      # The changes should not be committed to any branch: the "releases" are not part of the version history.
+      - name: Version packages
+        run: pnpm changeset version --snapshot dev
+
+      # Note: must happen after versioning because the updated package.json files will be copied into dist/
+      - name: Build packages
+        run: pnpm build-packages
+
+      - name: Publish packages
+        run: |
+          echo "Published packages" >> publish.log
+          echo "==================" >> publish.log
+          echo "" >> publish.log
+
+          # Stdout of publish contains the published package names and versions
+          pnpm publish -r --access public --tag dev --no-git-checks | tee -a publish.log
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+      - name: List packages
+        run: 
+          cat publish.log
+