Apply suggestions from code review

Co-authored-by: Márk Sági-Kazár <sagikazarmark@users.noreply.github.com>
Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

examples/config-example.tmpl

@@ -1,54 +0,0 @@
-issuer: {{ getenv "DEX_ISSUER" "http://127.0.0.1:5556/dex" }}
-
-storage:
-  type: sqlite3
-  config:
-    file: {{ getenv "DEX_STORAGE_SQLITE3_CONFIG_FILE" "/etc/dex/dex.db" }}
-
-web:
-{{- if getenv "DEX_WEB_HTTPS" "" }}
-  https: {{ .Env.DEX_WEB_HTTPS }}
-  {{- if getenv "DEX_WEB_TLS_KEY" }}
-  tlsKey: {{ .Env.DEX_WEB_TLS_KEY }}
-  {{- else }}
-{{- fail "$DEX_WEB_TLS_KEY is required" }}
-  {{- end }}
-  {{- if getenv "DEX_WEB_TLS_CERT" "" }}
-  tlsCert: {{ .Env.DEX_WEB_TLS_CERT }}
-  {{- else }}
-{{- fail "$DEX_WEB_TLS_CERT is required" }}
-  {{- end }}
-{{- end }}
-  http: {{ getenv "DEX_WEB_HTTP" "0.0.0.0:5556" }}
-
-{{- if getenv "DEX_TELEMETRY_HTTP" "" }}
-telemetry:
-  http: {{ .Env.DEX_TELEMETRY_HTTP }}
-{{- end }}
-
-expiry:
-  deviceRequests: {{ getenv "DEX_EXPIRY_DEVICE_REQUESTS" "5m" }}
-  signingKeys: {{ getenv "DEX_EXPIRY_SIGNING_KEYS" "6h" }}
-  idTokens: {{ getenv "DEX_EXPIRY_ID_TOKENS" "24h" }}
-  authRequests: {{ getenv "DEX_EXPIRY_AUTH_REQUESTS" "24h" }}
-
-logger:
-  level: {{ getenv "DEX_LOGGER_LEVEL" "info" }}
-  format: {{ getenv "DEX_LOGGER_FORMAT" "text" }}
-
-oauth2:
-  responseTypes: {{ getenv "DEX_OAUTH2_RESPONSE_TYPES" "[code]" }}
-  skipApprovalScreen: {{ getenv "DEX_OAUTH2_SKIP_APPROVAL_SCREEN" "false" }}
-  alwaysShowLoginScreen: {{ getenv "DEX_OAUTH2_ALWAYS_SHOW_LOGIN_SCREEN" "false" }}
-{{- if getenv "DEX_OAUTH2_PASSWORD_CONNECTOR" "" }}
-  passwordConnector: {{ .Env.DEX_OAUTH2_PASSWORD_CONNECTOR }}
-{{- end }}
-
-enablePasswordDB: {{ getenv "DEX_ENABLE_PASSWORD_DB" "true" }}
-
-connectors:
-{{- if getenv "DEX_CONNECTORS_ENABLE_MOCK" "" }}
-- type: mockCallback
-  id: mock
-  name: Example
-{{- end }}