fix(misc): graceful pprof shutdown, Makefile and config comment syntax

Replace bare http.ListenAndServe in InitDebug with an http.Server that
shuts down cleanly on context cancellation. Remove build from .PHONY in
Makefile. Fix comment markers in config.yml.example from // to #.

Author: nman98

Makefile

@@ -2,7 +2,7 @@
 # Build and install the indexer and API
 ########################################################
 
-.PHONY: build build-indexer build-api clean
+.PHONY: build-indexer build-api clean
 
 # Get git information
 GIT_COMMIT := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")

config.yml.example

@@ -4,8 +4,8 @@
 # the indexer can listen to http or https
 rpc: http://localhost:26657
 
-// Uncomment the following line to set a custom user agent
-// user_agent: gnoland-indexer
+# Uncomment the following line to set a custom user agent
+# user_agent: gnoland-indexer
 
 # Pool configuration
 # these are settings related to the database connection pool

indexer/main_operator/debug.go

@@ -14,8 +14,18 @@ import (
 func InitDebug(ctx context.Context) {
 	l.Info().Msg("Debug mode started")
 	go printMemStats(ctx, 5*time.Second)
-	go http.ListenAndServe(":6060", nil)
+
+	server := &http.Server{Addr: ":6060"}
+	go func() {
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			l.Error().Err(err).Msg("debug pprof server failed")
+		}
+	}()
+
 	<-ctx.Done()
+	if err := server.Shutdown(context.Background()); err != nil {
+		l.Error().Err(err).Msg("failed to shut down debug pprof server")
+	}
 	l.Info().Msg("Debug mode stopped")
 }