Added missing config file for nginx.

pcbnew/github/nginx.conf

@@ -0,0 +1,64 @@
+# Author: <Dick Hollenbeck> dick@softplc.com
+# Configuration file for nginx.  Nginx works as a nice cache-ing proxy for
+# the github footprint repos in a local nginx instance.
+
+
+# In my case I also added a small RAM disk on a linux server to hold the cache.
+# This line in /etc/fstab adds my RAM disk, this is 10 mbytes but 5mb would
+# probably suffice:
+none            /var/cache/nginx                          tmpfs   size=10m
+
+# I then set my KIGITHUB environment variable to
+# export KIGITHUB=http://my_server:54321/KiCad
+
+# Note that http is used between kicad and nginx, not https.  However nginx uses
+# https when refreshing from github.  http is faster than https.
+
+# You can run nginx either on your local machine, or on a server on your network,
+# or a server on the Internet.  In my case I run it on my network.  I imagine
+# that even a Raspery Pi would act as a decent caching server so long as you
+# install nginx and give the machine Internet access.
+
+
+worker_processes 2;
+
+events {
+    worker_connections  1024;
+}
+
+
+http {
+    proxy_cache_path /var/cache/nginx keys_zone=cache_zone:10m;
+
+    server {
+        # nginx will listen on this port:
+        listen 54321;
+
+        proxy_cache cache_zone;
+
+        # hold the stuff for one week, then mark it as out of date which will
+        # cause it to be reloaded from github.
+        proxy_cache_valid 1w;
+
+        location /KiCad/ {
+            rewrite /KiCad/(.+) /KiCad/$1/zip/master break;
+
+            # Skip past the redirect issued by https://github.com
+            proxy_pass  https://codeload.github.com;
+
+                proxy_set_header Proxy-Connection "Keep-Alive";
+
+            proxy_ignore_headers "Set-Cookie";
+            proxy_ignore_headers "Cache-Control";
+            proxy_ignore_headers "Expires";
+
+            proxy_cache_bypass $http_secret_header;
+
+            add_header X-Cache-Status $upstream_cache_status;
+
+            # This line causes github.com to return a "502 Bad Gateway Error"
+            # so do not include it:
+                # proxy_set_header Host $http_host;
+        }
+    }
+}