move over to sqlite3 storage

conf/00-default.yaml

@@ -24,7 +24,8 @@ oidc:
   server_url: https://oauth.example.com
   signing_algorithm: ES512
   client_id: your-client-id
-  client_secret: your-client-secret
+  client_secret:
+    from_env: OAUTH_CLIENT_SECRET
 pkce_cookie:
   name: app_pkce_code
   secure: true
@@ -34,12 +35,15 @@ session_cookie:
   name: app_session_key
   secure: true
   ttl: 7200
-  pepper: secret-pepper-value
+  pepper:
+    from_env: SESSION_HASH_PEPPER
 snowflake_uid:
   epoch: 1577836800000
   instance: 0  # todo: This should be populated by a StatefulSet ordinal in k8s; Need to prototype
 storage:
-  engine: file
+  engine: sqlite3
+  pool_min: 2
+  pool_max: 10
 argon2:
   # Using the argon2id variant with a time cost of 3 and memory cost 64MiB (65536)
   # is the recommendation for memory constrained environments, according to RFC 9106. If