manifest caching: drop from 1s to 0s (expire immediately), so we can hit ratelimit faster (#54)

- mostly for sanity-checking purposes, last release in 0.4.x series.
- next release after this will make those configurable.

Author: rpardini

nginx.conf

@@ -289,7 +289,7 @@ echo "Docker configured with HTTPS_PROXY=$scheme://$http_host/"
             proxy_cache_key   $uri;
             proxy_intercept_errors on;
             proxy_cache_use_stale  error timeout http_500 http_502 http_504 http_429;
-            proxy_cache_valid 1s;
+            proxy_cache_valid 0s;
             error_page 301 302 307 = @handle_redirects;
         }
 
@@ -301,7 +301,7 @@ echo "Docker configured with HTTPS_PROXY=$scheme://$http_host/"
             proxy_cache_key   $uri;
             proxy_intercept_errors on;
             proxy_cache_use_stale  error timeout http_500 http_502 http_504 http_429;
-            proxy_cache_valid 1s;
+            proxy_cache_valid 0s;
             error_page 301 302 307 = @handle_redirects;
         }