explicitly use docker library

gitea/application.yaml

@@ -80,7 +80,7 @@ spec:
             - jq '{"strategyKey":"OpenID","config":{"Provider":"openidConnect","ClientID":$ENV.OIDC_CLIENT_ID,"ClientSecret":$ENV.OIDC_CLIENT_SECRET,"OpenIDConnectAutoDiscoveryURL":"https://auth.k-space.ee/.well-known/openid-configuration","CustomURLMapping":null,"IconURL":"","Scopes":null,"RequiredClaimName":"","RequiredClaimValue":"","GroupClaimName":"","AdminGroup":"","GroupTeamMap":"","GroupTeamMapRemoval":false,"RestrictedGroup":""}} | "UPDATE login_source SET cfg=\(.config|tostring|@sh) WHERE name=\(.strategyKey|tostring|@sh) LIMIT 1"' -n -r > /tmp/update.sql
       containers:
         - name: mysql
-          image: mysql
+          image: mirror.gcr.io/library/mysql:latest
           imagePullPolicy: IfNotPresent
           volumeMounts:
             - mountPath: /tmp