feat: add otel tracing

Caddyfile

@@ -15,7 +15,13 @@
 
 (application_base) {
 	import application_logging {args[0]}
-	reverse_proxy host.containers.internal:{args[1]}
+
+    tracing {
+        span api
+    }
+
+    reverse_proxy host.containers.internal:{args[1]}
+
 }
 
 (internal_base) {
@@ -24,7 +30,7 @@
 }
 
 {
-	log default {
+    log default {
 		output stdout
 		output file /var/log/caddy/caddy_main.log {
 			roll_size 100MiB

caddy.Dockerfile

@@ -4,3 +4,7 @@ RUN apk update && \
     apk add nss-tools
 
 COPY ./Caddyfile /etc/caddy
+
+ENV OTEL_EXPORTER_OTLP_ENDPOINT=otlp://host.containers.internal:4318
+ENV OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=otlp://host.containers.internal:4318
+ENV OTEL_EXPORTER_OTLP_INSECURE=true