Generalize proxy external auth #3
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Replaced the seperate flow urls (login,validate...etc) with a single issuer url that defines which flows the IDP supports, making the possible authentication methods supported by the proxy more flexible and IDP dependent.
Added code_challenge_method (PKCE) environment, in case the IDP cannot explicitely provide a secret.
Kept the client_secret env, in case the IDP is able to explicitely add villas as a client.
Changed ingress proxy annotations to account for headers possibly being too big with some auth flows.
If wou want to test, use a keycloak instance ( as an example ), with
KC_PROXY=edgeandKC_PROXY_HEADERS=xforwardedBoth the public and confidential client configurations should work properly.