Start PostgreSQL and set BROWSER for integration tests

.drone.jsonnet

@@ -139,9 +139,19 @@ local Unit(db) = cachedPipeline(
 // PIPELINE 4: runs integration tests
 // It installs a local instance an run integration test with Python scripts
 // that use Selenium (located in scripts/browser_test).
-local Integration(db) = cachedPipeline(
+local Integration(db) = {
+} + basePipeline(
     "integration-" + db,
     [
+        restoreCache,
+        startDb(db),
+        {
+            name: "integration-" + db,
+            image: plumeEnv,
+            environment: {
+                BROWSER: "firefox",
+            },
+            commands: [
                 // Install the front-end
                 "cargo web deploy -p plume-front",
                 // Install the server
@@ -152,6 +162,9 @@ local Integration(db) = cachedPipeline(
                 + db + '" --force --path plume-cli',
                 // Run the tests
                 "./script/run_browser_test.sh"
+            ],
+        },
+        saveCache,
     ]
 );