Format all files with prettier VSCode plugin and add yamllint in CI (#413)

@justusbunsi to end my formatting mess... ;)

I am not fully sure myself about the linebreaks in `values.yaml` but I don't think there's an easy way to change that behavior.

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/413
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Co-committed-by: pat-s <patrick.schratz@gmail.com>

Chart.yaml

@@ -33,13 +33,13 @@ maintainers:
 
 # Bitnami charts are served from GitHub CDN - See https://github.com/bitnami/charts/issues/10539 for details
 dependencies:
-# OCI registry: https://blog.bitnami.com/2023/01/bitnami-helm-charts-available-as-oci.html (2023-01)
-# Chart release date: 2023-03
-- name: memcached
-  repository: oci://registry-1.docker.io/bitnamicharts
-  version: 6.3.13
-  condition: memcached.enabled
-- name: postgresql
-  repository: oci://registry-1.docker.io/bitnamicharts
-  version: 12.2.6
-  condition: postgresql.enabled
+  # OCI registry: https://blog.bitnami.com/2023/01/bitnami-helm-charts-available-as-oci.html (2023-01)
+  # Chart release date: 2023-03
+  - name: memcached
+    repository: oci://registry-1.docker.io/bitnamicharts
+    version: 6.3.13
+    condition: memcached.enabled
+  - name: postgresql
+    repository: oci://registry-1.docker.io/bitnamicharts
+    version: 12.2.6
+    condition: postgresql.enabled