ci: move e2e tests from travis to circleci (#27937)

PR Close #27937

scripts/build-e2e-tests.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+# Legacy bash script that builds the e2e tests partially using Bazel and old Bash build scripts.
+# These scripts will be removed in the future and should be replaced by Bazel's test command.
+
+# Immediately exit if any command failed.
+set -e
+
+# Go to project directory.
+cd $(dirname ${0})/../
+
+BAZEL=`yarn bin bazel`
+BAZEL_BIN_DIR=`${BAZEL} info bazel-bin`
+
+if [[ ! ${*} == *--use-existing-packages-dist* ]]; then
+  # Build all Angular release packages (this does not include //packages/benchpress)
+  ./scripts/build-packages-dist.sh
+fi
+
+# Build the "@angular/benchpress" package which is required for running e2e perf tests.
+yarn bazel build //packages/benchpress:npm_package
+
+# Copy the NPM package output of the benchpress package to the "packages-dist" directory.
+# This simplifies our path mappings for tests depending on these built packages.
+mkdir dist/packages-dist/benchpress
+cp -R ${BAZEL_BIN_DIR}/packages/benchpress/npm_package/* dist/packages-dist/benchpress
+
+# Symlinks the Bazel "packages-dist" output to "dist/all/@angular" so that it can be used in
+# combination with "$NODE_PATH" for a proper module resolution. Note that this is outdated
+# and shouldn't be necessary if we run tests using Bazel in the future.
+mkdir -p ./dist/all
+(cd ./dist/all; ln -s ../packages-dist/ "@angular")
+
+# Build the modules which contain the playground and benchmark e2e tests. These
+# can be served by running "gulp serve".
+./modules/build.sh
+
+# Build the examples package which also contains various e2e tests. These can be
+# served by running "gulp serve-examples".
+./packages/examples/build.sh