github: use litd staging branch for itests

We actually want to run the litd itests on the staging branch that has
the custom channel tests.
We also can speed up the tests by removing the yarn build for the static
files, since we don't need those for the tests (an empty index.html just
needs to exist for the build to succeed).

.github/workflows/main.yaml

@@ -20,6 +20,8 @@ env:
   GOPATH: /home/runner/work/go
 
   GO_VERSION: '1.22.3'
+
+  LITD_ITEST_BRANCH: '0-19-staging'
 
 jobs:
   #######################
@@ -306,29 +308,26 @@ jobs:
         uses: ./.github/actions/setup-go
 
       - name: Clone Lit repository
-        run: git clone https://github.com/lightninglabs/lightning-terminal.git
+        uses: actions/checkout@v3
+        with:
+          repository: lightninglabs/lightning-terminal
+          ref: ${{ env.LITD_ITEST_BRANCH }}
+          path: lightning-terminal
 
       - name: Update go.mod to use the local Tap repository
         working-directory: ./lightning-terminal
         run: |
           go mod edit -replace=github.com/lightning-labs/taproot-assets=../
           go mod tidy
 
-      - name: Install yarn
-        run: npm install -g yarn
-
-      - name: setup nodejs
-        uses: ./lightning-terminal/.github/actions/setup-node
-        with:
-          node-version: 16.x
-
-      - name: install LiT app dependencies
-        working-directory: ./lightning-terminal/app
-        run: yarn
+      - name: Create dummy static files
+        run: |
+          mkdir -p lightning-terminal/app/build
+          touch lightning-terminal/app/build/index.html
 
       - name: Run LiT itests
         working-directory: ./lightning-terminal
-        run: make itest
+        run: make itest-only
 
       - name: Run LiT unit tests
         working-directory: ./lightning-terminal
@@ -337,7 +336,7 @@ jobs:
   # Notify about the completion of all coverage collecting jobs.
   finish:
     if: ${{ always() }}
-    needs: [unit-test]
+    needs: [ unit-test ]
     runs-on: ubuntu-latest
     steps:
       - uses: shogo82148/actions-goveralls@v1