feat: docker configuration

docker/Caddyfile.tpl

@@ -0,0 +1,10 @@
+http://%%DOMAIN%% {
+    root * /var/www/html
+    file_server
+
+    log {
+        output stdout
+        format %%LOGFORMAT%%
+        level %%LOGLEVEL%%
+    }
+}

docker/entrypoint.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ ! -e "/etc/Caddyfile" ]; then
+    sed -i "s#%%DOMAIN%%#${DOMAIN:-localhost}#g" /etc/Caddyfile.tpl
+    sed -i "s#%%LOGLEVEL%%#${LOGLEVEL:-INFO}#g" /etc/Caddyfile.tpl
+    sed -i "s#%%LOGFORMAT%%#${LOGFORMAT:-json}#g" /etc/Caddyfile.tpl
+    mv /etc/Caddyfile.tpl /etc/Caddyfile
+else
+    rm -f /etc/Caddyfile.tpl
+fi
+
+exec caddy run --config /etc/Caddyfile