ci: fix broken publish + changeset integrity (#2433)

.github/workflows/changesets.yml

 ---
-name: 'Changeset integrity checker'
+name: Changeset integrity checker
 on:
   - pull_request_target
 
@@ -10,5 +10,8 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
 
-      - name: 'changeset status'
+      - name: Install Dependencies
+        uses: yarn
+
+      - name: Changeset Status
         run: npx changeset status

.github/workflows/release.yml

@@ -170,8 +170,8 @@ jobs:
       - name: Publish go-builder
         uses: docker/build-push-action@v2
         with:
-          context: ./ops/docker/go-builder
-          file: ./Dockerfile
+          context: .
+          file: ./ops/docker/go-builder/Dockerfile
           push: true
           tags: ethereumoptimism/go-builder:${{ needs.release.outputs.go-builder }},ethereumoptimism/go-builder:latest
 
@@ -196,8 +196,8 @@ jobs:
       - name: Publish js-builder
         uses: docker/build-push-action@v2
         with:
-          context: ./ops/docker/js-builder
-          file: ./Dockerfile
+          context: .
+          file: ./ops/docker/js-builder/Dockerfile
           push: true
           tags: ethereumoptimism/js-builder:${{ needs.release.outputs.js-builder }},ethereumoptimism/js-builder:latest