completely reworked caching, now cache by exception (/blobs/ only essentially)

- now only /v2/.../blobs/... URIs are actually cached (together with their redirect catchers)
- /manifests/, /token, and /v2/ are not cached anymore, which should solve a lot of problems
- better messages for /v1 attempts
- fix usage of $connect_host:443 (which is hostname:port and causes errors to be logged) to $connect_addr (which returns an IP:port) in the proxy layer

Dockerfile

@@ -47,6 +47,8 @@ ENV AUTH_REGISTRIES="some.authenticated.registry:oneuser:onepassword another.reg
 ENV VERIFY_SSL="true"
 # Enable debugging mode; this inserts mitmproxy/mitmweb between the CONNECT proxy and the caching layer
 ENV DEBUG="true"
+# Enable nginx debugging mode; this uses nginx-debug binary and enabled debug logging, which is VERY verbose so separate setting
+ENV DEBUG_NGINX="false"
 
-# Did you want a shell? Sorry. This only does one job; use exec /bin/bash if you wanna inspect stuff
+# Did you want a shell? Sorry, the entrypoint never returns, because it runs nginx itself. Use 'docker exec' if you need to mess around internally.
 ENTRYPOINT ["/entrypoint.sh"]