Add healthcheck configuration to Dockerfile and Caddyfile for frankenphp variation

- Introduced a HEALTHCHECK command in the Dockerfile with specified parameters.
- Updated Caddyfile to define healthcheck endpoints and log skipping for both default and custom healthcheck paths.
- Enhanced full Caddyfile to redirect localhost healthcheck requests to HTTPS.

Author: jaydrogers

src/variations/frankenphp/Dockerfile

@@ -227,4 +227,7 @@ EXPOSE 8080 8443 8443/udp 2019
 
 ENTRYPOINT ["docker-php-serversideup-entrypoint"]
 
-CMD ["frankenphp", "run", "--config", "/etc/frankenphp/Caddyfile", "--adapter", "caddyfile"]
+CMD ["frankenphp", "run", "--config", "/etc/frankenphp/Caddyfile", "--adapter", "caddyfile"]
+
+HEALTHCHECK --start-period=60s --start-interval=3s --interval=10s --timeout=3s --retries=3 \
+    CMD [ "sh", "-c", "curl --insecure --silent --location --show-error --fail http://localhost:8080$HEALTHCHECK_PATH || exit 1" ]

src/variations/frankenphp/etc/frankenphp/Caddyfile

@@ -63,12 +63,18 @@ fd00::/8 \
 	# Match serversideup/php log levels to Caddy address log levels
 	import log-level/address/{$LOG_OUTPUT_LEVEL:info}.caddyfile
 
-	# Healthcheck endpoint
-	@health {
+	# Define the Caddy healthcheck endpoint
+	@caddy-healthcheck {
 		path /healthcheck
 	}
-	respond @health "OK" 200
-	log_skip @health
+	respond @caddy-healthcheck "OK" 200
+	log_skip @caddy-healthcheck
+
+	# Define the custom healthcheck endpoint
+	@healthcheckpath {
+		path {$HEALTHCHECK_PATH:/healthcheck}
+	}
+	log_skip @healthcheckpath
 
 	php_server {
 		{$CADDY_PHP_SERVER_OPTIONS}

src/variations/frankenphp/etc/frankenphp/ssl-mode/full.caddyfile

@@ -1,4 +1,14 @@
 {$CADDY_HTTP_SERVER_ADDRESS:http://} {
+	# Redirect localhost healthcheck requests to HTTPS with the correct port
+	@healthcheck {
+		remote_ip 127.0.0.1/8 ::1
+		path /healthcheck # Caddy healthcheck endpoint
+		path {$HEALTHCHECK_PATH:/healthcheck} # Custom healthcheck endpoint
+	}
+	log_skip @healthcheck
+	redir @healthcheck https://localhost:{$CADDY_HTTPS_PORT:8443}{uri} 308
+
+	# Redirect all other traffic to HTTPS (without explicit port)
 	redir https://{host}{uri} 308
 }