Add missing env vars

.github/workflows/release-candidate-pr.yml

@@ -13,6 +13,16 @@ permissions:
   contents: write
   pull-requests: write
 
+env:
+  # Common versions
+  GO_VERSION: '1.21'
+  DOCKER_BUILDX_VERSION: 'v0.9.1'
+
+  # Common users. We can't run a step 'if secrets.XXX != ""' but we can run a
+  # step 'if env.XXX' != ""', so we copy these to succinctly test whether
+  # credentials have been provided before trying to run steps that need them.
+  UPBOUND_MARKETPLACE_PUSH_ROBOT_USR: ${{ secrets.UPBOUND_MARKETPLACE_PUSH_ROBOT_USR }}
+
 jobs:
   create-rc-pr:
     # We don't want to run this on main upon merging the PR we are creating.
@@ -110,7 +120,6 @@ jobs:
       # publish only works on branches main, master and release-
       run: |
         git checkout -b release-$VERSION
-        make publish BRANCH_NAME=release-$VERSION
 
     - name: Publish Artifacts
       if: env.UPBOUND_MARKETPLACE_PUSH_ROBOT_USR != ''