chore: add missing install and build steps

.github/workflows/publish.yml

@@ -48,6 +48,10 @@ jobs:
     if: "${{ contains(github.event.head_commit.message, 'chore(release): publish') == false }}"
     runs-on: ubuntu-latest
     steps:
+      - name: Install dependencies
+        run: yarn install --immutable
+      - name: Build
+        run: yarn build:snjs
       - name: Login to Docker Hub
         if: "${{ contains(github.event.head_commit.message, 'skip e2e') == false }}"
         uses: docker/login-action@v2

.github/workflows/snjs.pr.yml

@@ -37,6 +37,10 @@ jobs:
   build-docker:
     runs-on: ubuntu-latest
     steps:
+      - name: Install dependencies
+        run: yarn install --immutable
+      - name: Build
+        run: yarn build:snjs
       - name: Login to Docker Hub
         uses: docker/login-action@v2
         with: