Switch from yarn to pnpm

Author: SergeAstapov

.github/workflows/publish.yml

@@ -27,12 +27,17 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
       - uses: actions/setup-node@v6
         with:
           node-version: 22
           registry-url: 'https://registry.npmjs.org'
-      - run: npm ci
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - run: npm install -g npm@latest # ensure that the globally installed npm is new enough to support OIDC
       - name: Publish to NPM
-        run: npx release-plan publish --provenance
+        run: NPM_CONFIG_PROVENANCE=true pnpm release-plan publish
         env:
           GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}

.travis.yml

@@ -109,7 +109,8 @@
   },
   "volta": {
     "node": "18.20.4",
-    "yarn": "1.22.22"
+    "yarn": "1.22.22",
+    "pnpm": "10.24.0"
   },
   "ember": {
     "edition": "octane"