Support custom envs for Action DinD container (#722)

Follow-up to https://gitea.com/gitea/helm-chart/pulls/666.

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/722
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Co-committed-by: justusbunsi <sk.bunsenbrenner@gmail.com>

templates/gitea/act_runner/statefulset.yaml

@@ -77,6 +77,9 @@ spec:
               value: "1"
             - name: DOCKER_CERT_PATH
               value: /certs/server
+            {{- if .Values.actions.statefulset.dind.extraEnvs }}
+            {{- toYaml .Values.actions.statefulset.dind.extraEnvs | nindent 12 }}
+            {{- end }}
           securityContext:
             privileged: true
           resources: