feat: inject cli state values (--state-values-set) into environment templating context (#1917)

* feat: inject cli state values (--state-values-set) into environment templating context

Signed-off-by: Vincent Chenal <vincent.chenal@protonmail.com>

* test: added envvals_loader unit test for environment values

Signed-off-by: Vincent Chenal <vincent.chenal@protonmail.com>

* test: added 'state values set cli args in environments' integration test

Signed-off-by: Vincent Chenal <vincent.chenal@protonmail.com>

* fix: merge environments before loadValuesEntries

Signed-off-by: Vincent Chenal <vincent.chenal@protonmail.com>

* fix: 'state values set cli args in environments' integration test

Signed-off-by: Vincent Chenal <vincent.chenal@protonmail.com>

---------

Signed-off-by: Vincent Chenal <vincent.chenal@protonmail.com>

test/integration/test-cases/state-values-set-cli-args-in-environments/input/environments.yaml.gotmpl

@@ -0,0 +1,2 @@
+---
+foo: {{ .Values.foo }}

test/integration/test-cases/state-values-set-cli-args-in-environments/input/helmfile-extra-args

@@ -0,0 +1 @@
+--state-values-set foo=bar

test/integration/test-cases/state-values-set-cli-args-in-environments/input/helmfile.yaml.gotmpl

@@ -0,0 +1,17 @@
+environments:
+  default:
+    values:
+      - environments.yaml.gotmpl
+---
+releases:
+- name: state-value-set-args-environments
+  chart: ../../../charts/raw
+  values:
+  - templates:
+    - |
+      apiVersion: v1
+      kind: ConfigMap
+      metadata:
+        name: test
+      data:
+        foo: {{ .Values.foo }}

test/integration/test-cases/state-values-set-cli-args-in-environments/output/output.yaml

@@ -0,0 +1,8 @@
+---
+# Source: raw/templates/resources.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test
+data:
+  foo: bar