Add e2e test for post-renderer

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>
Signed-off-by: yxxhero <aiopsclub@163.com>

test/e2e/template/helmfile/testdata/postrenderers/add-cm1.bash

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+cat $1
+echo "---"
+
+cat <<EOS
+apiVersion: v1
+kind: ConfigMap
+data:
+  one: ONE
+metadata:
+  name: cm1
+EOS

test/e2e/template/helmfile/testdata/postrenderers/add-cm2.bash

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+cat $1
+echo "---"
+
+cat <<EOS
+apiVersion: v1
+kind: ConfigMap
+data:
+  two: TWO
+metadata:
+  name: cm2
+EOS

test/e2e/template/helmfile/testdata/snapshot/postrenderer/config.yaml

@@ -0,0 +1,6 @@
+localDockerRegistry:
+  enabled: true
+  port: 5001
+chartifyTempDir: temp1
+helmfileArgs:
+- template

test/e2e/template/helmfile/testdata/snapshot/postrenderer/input.yaml

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+helmDefaults:
+  postRenderer: ../../postrenderers/add-cm1.bash
+
+releases:
+- name: foo
+  chart: ../../charts/raw-0.1.0
+  values:
+  - templates:
+    - |
+      apiVersion: v1
+      kind: ConfigMap
+      metadata:
+        name: {{`{{ .Release.Name }}`}}-1
+        namespace: {{`{{ .Release.Namespace }}`}}
+      data:
+        foo: FOO
+    dep:
+      templates:
+      - |
+        apiVersion: v1
+        kind: ConfigMap
+        metadata:
+          name: {{`{{ .Release.Name }}`}}-2
+          namespace: {{`{{ .Release.Namespace }}`}}
+        data:
+          bar: BAR
+  postRenderer: ../../postrenderers/add-cm2.bash
+- name: baz
+  chart: ../../charts/raw-0.1.0
+  values:
+  - templates:
+    - |
+      apiVersion: v1
+      kind: ConfigMap
+      metadata:
+        name: {{`{{ .Release.Name }}`}}-3
+        namespace: {{`{{ .Release.Namespace }}`}}
+      data:
+        baz: BAZ
+  dependencies:
+  - alias: dep
+    chart: oci://localhost:5001/myrepo/raw
+    version: 0.1.0

test/e2e/template/helmfile/testdata/snapshot/postrenderer/output.yaml

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+Building dependency release=foo, chart=../../charts/raw-0.1.0
+Building dependency release=baz, chart=$WD/temp1/baz
+Hang tight while we grab the latest from your chart repositories...
+...Successfully got an update from the "myrepo" chart repository
+...Successfully got an update from the "istio" chart repository
+Update Complete. ⎈Happy Helming!⎈
+Saving 1 charts
+Downloading raw from repo oci://localhost:5001/myrepo
+Pulled: localhost:5001/myrepo/raw:0.1.0
+Digest: $DIGEST
+Deleting outdated charts
+
+Templating release=foo, chart=../../charts/raw-0.1.0
+---
+# Source: raw/templates/resources.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: foo-1
+  namespace: default
+data:
+  foo: FOO
+---
+apiVersion: v1
+kind: ConfigMap
+data:
+  two: TWO
+metadata:
+  name: cm2
+
+Templating release=baz, chart=$WD/temp1/baz
+---
+# Source: raw/templates/resources.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: baz-3
+  namespace: default
+data:
+  baz: BAZ
+---
+apiVersion: v1
+kind: ConfigMap
+data:
+  one: ONE
+metadata:
+  name: cm1
+