ci: simplify trunk jobs

Author: turadg

.github/workflows/trunk.yml

@@ -9,19 +9,8 @@ on:
       - main
 
 jobs:
-  build:
-    if: ${{ github.repository_owner == 'agoric' }}
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
-        with:
-          node-version: 18
-          cache: 'yarn'
-          cache-dependency-path: yarn.lock
-
   dev-canary:
-    needs: build
+    if: ${{ github.repository_owner == 'agoric' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3