switch cypress integration testing to use gradle

Update Github actions versions. Use Java 19.
Set max heap to 7G using dedicated parameter.
Use UI commit where 'yarn start-backend' has been changed
to use 'gradle runBackend'.

.github/workflows/cypress-integration.yml

@@ -12,31 +12,27 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      # Checkout each repo into sub-directories
-      - uses: actions/checkout@v2
+      # Checkout each the UI and R5 into separate subdirectories
+      - uses: actions/checkout@v3
         with:
           repository: conveyal/analysis-ui
-          ref: 1701bd9aea859a4714bc3f35f5bcf767a3256a64
+          ref: 6804e28bf03063d7afd169086e09f651bb9eeec0
+          fetch-depth: 0
           path: ui
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
           path: r5
-      # Build .jar and copy to ./ui directory (along with config file)
-      # Cache Gradle dependencies to speed up the shadow jar build
-      - uses: actions/cache@v1
-        id: cache
-        with:
-          path: ~/.gradle/caches
-          key: gradle-caches
-      - uses: actions/setup-java@v1
+      # Build R5 and check that it can start up as a backend
+      - uses: actions/setup-java@v3
         with:
-          java-version: 11
-      - run: gradle shadowJar -x test
+          distribution: temurin
+          java-version: 19
+          cache: gradle
+      - run: |
+          cp analysis.properties.template analysis.properties
+          gradle testRunnable -x test
         working-directory: r5
-      - run: cp $(ls ./r5/build/libs/*-all.jar | head -n1) ./ui/latest.jar
-      - run: cp ./r5/analysis.properties.template ./ui/analysis.properties
-
       # Install / cache dependencies with Cypress to handle caching Cypress binary.
       - uses: actions/setup-node@v2
         with:

build.gradle

@@ -83,6 +83,7 @@ application {
 // Run R5 as a local analysis backend with all dependencies on the classpath, without building a shadowJar.
 task runBackend (type: JavaExec) {
     dependsOn(build)
+    maxHeapSize('7G')
     classpath(sourceSets.main.runtimeClasspath)
     main("com.conveyal.analysis.BackendMain")
 }