Fix CI workflow env scoping

Author: adibhanna

.github/workflows/ci.yml

@@ -17,8 +17,6 @@ jobs:
   build:
     name: Build (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
-    env:
-      GOCACHE: ${{ runner.temp }}/go-build-cache
     strategy:
       fail-fast: false
       matrix:
@@ -46,4 +44,6 @@ jobs:
         run: npm ci
 
       - name: Typecheck and build app
+        env:
+          GOCACHE: ${{ runner.temp }}/go-build-cache
         run: npm run build:prod