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Adds passwordless authentication to vprox using Modal's OIDC identity tokens. Setting
VPROX_AUTH_MODE=oidc-modalon the server enables JWT verification against Modal's OIDC issuer — on startup, the server performs OIDC discovery, fetches the JWKS signing keys, and validates every incoming token's signature, expiry, issuer, and optionally audience and workspace ID. On the client side, Modal injectsMODAL_IDENTITY_TOKENinto containers automatically; the client passes it to vprox viaVPROX_OIDC_TOKEN="$MODAL_IDENTITY_TOKEN".The auth mode is explicitly named
oidc-modalrather than genericoidcsince the token claims are Modal-specific (workspace ID, environment, app, function, container). All configuration uses theVPROX_prefix. Access control is scoped to workspace IDs only (VPROX_OIDC_ALLOWED_WORKSPACE_IDS), with a*wildcard option that logs a warning for testing use.