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>

.drone.yml

@@ -40,6 +40,12 @@ steps:
       - make readme
       - git diff --exit-code --name-only README.md
 
+  - name: yaml lint
+    pull: always
+    image: cytopia/yamllint:alpine-1
+    commands:
+      - yamllint -f colored .
+
   - name: discord
     pull: always
     image: appleboy/drone-discord:1.2.4
@@ -53,7 +59,6 @@ steps:
         - changed
         - failure
 
-
 ---
 kind: pipeline
 type: docker

.yamllint

@@ -0,0 +1,20 @@
+---
+extends: default
+
+ignore: |
+  .yamllint
+  node_modules
+  templates
+
+
+rules:
+  truthy:
+    allowed-values: ['true', 'false']
+    check-keys: False
+    level: error
+  line-length: disable
+  document-start: disable
+  comments:
+    min-spaces-from-content: 1
+  braces:
+    max-spaces-inside: 2

values.yaml

@@ -138,7 +138,8 @@ ingress:
   enabled: false
   # className: nginx
   className:
-  annotations: {}
+  annotations:
+    {}
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
   hosts:
@@ -157,7 +158,8 @@ ingress:
 ## @section StatefulSet
 #
 ## @param resources Kubernetes resources
-resources: {}
+resources:
+  {}
   # We usually recommend not to specify default resources and to leave this as a conscious
   # choice for the user. This also increases chances charts run on environments with little
   # resources, such as Minikube. If you do want to specify resources, uncomment the following
@@ -192,7 +194,8 @@ dnsConfig: {}
 ## @param statefulset.labels Labels for the statefulset
 ## @param statefulset.annotations Annotations for the Gitea StatefulSet to be created
 statefulset:
-  env: []
+  env:
+    []
     # - name: VARIABLE
     #   value: my-value
   terminationGracePeriodSeconds: 60
@@ -293,7 +296,8 @@ gitea:
       #    prometheus-release: prom1
 
   ## @param gitea.ldap LDAP configuration
-  ldap: []
+  ldap:
+    []
     # - name: "LDAP 1"
     #  existingSecret:
     #  securityProtocol:
@@ -310,7 +314,8 @@ gitea:
 
   # Either specify inline `key` and `secret` or refer to them via `existingSecret`
   ## @param gitea.oauth OAuth configuration
-  oauth: []
+  oauth:
+    []
     # - name: 'OAuth 1'
     #   provider:
     #   key: