Add env files for Kind-in-Prow integration test jobs

The existing `test/e2e-tests-kind.env` is specifically for the `PipelineRun` approach. These new files are for running the e2e tests, via `kind`, in Prow.

There are four new env files - one for just the go e2e tests each for `stable` and `alpha`, and one for just the yaml tests each for `stable` and `alpha`.

Signed-off-by: Andrew Bayer <andrew.bayer@gmail.com>

test/e2e-tests-kind-prow-alpha-yaml.env

@@ -0,0 +1,6 @@
+SKIP_INITIALIZE=true
+PIPELINE_FEATURE_GATE=alpha
+EMBEDDED_STATUS_GATE=minimal
+RUN_YAML_TESTS=true
+SKIP_GO_E2E_TESTS=true
+KO_DOCKER_REPO=registry.local:5000

test/e2e-tests-kind-prow-alpha.env

@@ -0,0 +1,5 @@
+SKIP_INITIALIZE=true
+PIPELINE_FEATURE_GATE=alpha
+EMBEDDED_STATUS_GATE=minimal
+RUN_YAML_TESTS=false
+KO_DOCKER_REPO=registry.local:5000

test/e2e-tests-kind-prow-yaml.env

@@ -0,0 +1,5 @@
+SKIP_INITIALIZE=true
+PIPELINE_FEATURE_GATE=stable
+RUN_YAML_TESTS=true
+SKIP_GO_E2E_TESTS=true
+KO_DOCKER_REPO=registry.local:5000

test/e2e-tests-kind-prow.env

@@ -0,0 +1,4 @@
+SKIP_INITIALIZE=true
+PIPELINE_FEATURE_GATE=stable
+RUN_YAML_TESTS=false
+KO_DOCKER_REPO=registry.local:5000

test/e2e-tests.sh

@@ -25,6 +25,7 @@ PIPELINE_FEATURE_GATE=${PIPELINE_FEATURE_GATE:-stable}
 EMBEDDED_STATUS_GATE=${EMBEDDED_STATUS_GATE:-full}
 SKIP_INITIALIZE=${SKIP_INITIALIZE:="false"}
 RUN_YAML_TESTS=${RUN_YAML_TESTS:="true"}
+SKIP_GO_E2E_TESTS=${SKIP_GO_E2E_TESTS:="false"}
 failed=0
 
 # Script entry point.
@@ -66,7 +67,10 @@ function set_embedded_status() {
 function run_e2e() {
   # Run the integration tests
   header "Running Go e2e tests"
-  go_test_e2e -timeout=20m ./test/... || failed=1
+  # Skip ./test/*.go tests if SKIP_GO_E2E_TESTS == true
+  if [ "${SKIP_GO_E2E_TESTS}" != "true" ]; then
+    go_test_e2e -timeout=20m ./test/... || failed=1
+  fi
 
   # Run these _after_ the integration tests b/c they don't quite work all the way
   # and they cause a lot of noise in the logs, making it harder to debug integration