Remove installer script release tests

The tests for the `release` target used to provide value but now
all they're doing is testing features of `ko`. Remove them as the
main functionality of the installer script is already tested elsewhere.

test/e2e-tests.sh

@@ -108,14 +108,6 @@ test_dashboard() {
  $tekton_repo_dir/scripts/installer uninstall $@
 }
 
-if [ -z "$SKIP_BUILD_TEST" ]; then
- header "Validating that we can build the release manifests"
- echo "Building manifests for k8s"
- $tekton_repo_dir/scripts/installer release || fail_test "Failed to build manifests for k8s"
- echo "Building manifests for k8s --read-write"
- $tekton_repo_dir/scripts/installer release --read-write || fail_test "Failed to build manifests for k8s --read-write"
-fi
-
 header "Building browser E2E image"
 docker build -t dashboard-e2e packages/e2e