refactor(templates): move the templates out of the gitea subdirectory

The `templates/gitea` subdirectory did not group anything meaningful, since every template of this chart belongs to
Gitea. It only duplicated the chart name in every path and forced the unit tests to spell out
`templates/gitea/<name>.yaml`, while `_helpers.tpl` and `NOTES.txt` already lived directly in `templates`.

All templates now live in `templates`, which matches the layout of the bundled sub-charts and the Helm defaults.

The checksum helper in `templates/_secrets.tpl` built its include path from `$root.Template.BasePath` and therefore
carried the subdirectory in a `printf` format string instead of a literal path. Without adjusting it the chart failed to
render with "no template gitea/templates/gitea/secret_config.yaml associated with template gotpl".

Co-authored-by: Copilot <copilot@github.com>

unittests/helm/deployment/image-configuration.yaml

@@ -6,22 +6,22 @@ chart:
   # Override appVersion to be consistent with used digest :)
   appVersion: 1.19.3
 templates:
-  - templates/gitea/deployment.yaml
-  - templates/gitea/secret_admin.yaml
-  - templates/gitea/secret_config.yaml
-  - templates/gitea/secret_gpg.yaml
-  - templates/gitea/secret_init.yaml
-  - templates/gitea/secret_inlineConfig.yaml
-  - templates/gitea/secret_metrics.yaml
+  - templates/deployment.yaml
+  - templates/secret_admin.yaml
+  - templates/secret_config.yaml
+  - templates/secret_gpg.yaml
+  - templates/secret_init.yaml
+  - templates/secret_inlineConfig.yaml
+  - templates/secret_metrics.yaml
 tests:
   - it: default values
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     asserts:
       - equal:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3-rootless"
   - it: tag override
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment.gitea.image.tag: "1.19.4"
     asserts:
@@ -29,7 +29,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.4-rootless"
   - it: root-based image
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment.gitea.image.rootless: false
     asserts:
@@ -37,7 +37,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3"
   - it: scoped registry
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment.gitea.image.registry: "example.com"
     asserts:
@@ -45,7 +45,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "example.com/gitea:1.19.3-rootless"
   - it: global registry
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       global.imageRegistry: "global.example.com"
     asserts:
@@ -53,7 +53,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "global.example.com/gitea:1.19.3-rootless"
   - it: digest for rootless image
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment:
         gitea:
@@ -65,7 +65,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3-rootless@sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
   - it: image fullOverride (does not append rootless)
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment:
         gitea:
@@ -82,7 +82,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3"
   - it: digest for root-based image
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment:
         gitea:
@@ -94,7 +94,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.19.3@sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
   - it: digest and global registry
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       global.imageRegistry: "global.example.com"
       deployment.gitea.image.digest: "sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
@@ -103,7 +103,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "global.example.com/gitea:1.19.3-rootless@sha256:b28e8f3089b52ebe6693295df142f8c12eff354e9a4a5bfbb5c10f296c3a537a"
   - it: correctly renders floating tag references
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       # use non-quoted values on purpose. See: https://gitea.com/gitea/helm-gitea/issues/631
       deployment.gitea.image.tag: 1.21
@@ -124,7 +124,7 @@ tests:
           path: spec.template.spec.containers[0].image
           value: "docker.gitea.com/gitea:1.21-rootless"
   - it: init containers use their own image configuration
-    template: templates/gitea/deployment.yaml
+    template: templates/deployment.yaml
     set:
       deployment.initDirectories.image.registry: "init.example.com"
       deployment.initDirectories.image.tag: "1.19.4"