Move unit tests to after the build

Our code has new dependencies on VS Code that are pulled in when the
unit tests run.  Because of this we need to build VS Code before running
the unit tests (as it only pulls built code).

Author: code-asher

.github/workflows/ci.yaml

@@ -19,8 +19,6 @@ jobs:
     name: Pre-build checks
     runs-on: ubuntu-latest
     timeout-minutes: 15
-    env:
-      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
@@ -54,14 +52,6 @@ jobs:
         run: yarn lint
         if: success()
 
-      - name: Run code-server unit tests
-        run: yarn test:unit
-        if: success()
-
-      - name: Upload coverage report to Codecov
-        run: yarn coverage
-        if: success()
-
   audit-ci:
     name: Run audit-ci
     needs: prebuild
@@ -98,6 +88,8 @@ jobs:
     needs: prebuild
     runs-on: ubuntu-latest
     timeout-minutes: 30
+    env:
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
     steps:
       - uses: actions/checkout@v2
         with:
@@ -154,6 +146,17 @@ jobs:
         if: steps.cache-vscode.outputs.cache-hit != 'true'
         run: yarn build:vscode
 
+      # Our code imports code from VS Code's output directory meaning VS Code
+      # must be built before running these tests.
+      # TODO: Move to its own step?
+      - name: Run code-server unit tests
+        run: yarn test:unit
+        if: success()
+
+      - name: Upload coverage report to Codecov
+        run: yarn coverage
+        if: success()
+
       # The release package does not contain any native modules
       # and is neutral to architecture/os/libc version.
       - name: Create release package