Update 2.4-rc to 2.4-dev15

Author: TimWolla

2.4-rc/Dockerfile

@@ -90,12 +90,15 @@ RUN set -eux; \
 		USE_OPENSSL=1 \
 		USE_PCRE2=1 USE_PCRE2_JIT=1 \
 		USE_ZLIB=1 \
+{{ if env.version | startswith("2.") and ([ "2.0", "2.2", "2.3" ] | index(env.version) | not) then ( -}}
+		USE_PROMEX=1 \
+{{ ) else "" end -}}
 		\
 		EXTRA_OBJS=" \
-{{ if env.version | startswith("1.") then "" else ( -}}
+{{ if [ "2.0", "2.2", "2.3" ] | index(env.version) then ( -}}
 # see https://github.com/docker-library/haproxy/issues/94#issuecomment-505673353 for more details about prometheus support
 			contrib/prometheus-exporter/service-prometheus.o \
-{{ ) end -}}
+{{ ) else "" end -}}
 		" \
 	'; \
 {{ if env.variant == "alpine" then ( -}}

2.4-rc/alpine/Dockerfile

@@ -37,8 +37,8 @@
   "2.4-rc": {
     "alpine": "3.13",
     "debian": "buster-slim",
-    "sha256": "7bc370b61cce3c37305da48966da987f822fea50fc4c9cc5d7d73bff4775dd45",
-    "url": "https://www.haproxy.org/download/2.4/src/devel/haproxy-2.4-dev14.tar.gz",
-    "version": "2.4-dev14"
+    "sha256": "82f98e81f09c4df2ce3c01d9027f90d952513a2af57798e1932c4f8d555c23d6",
+    "url": "https://www.haproxy.org/download/2.4/src/devel/haproxy-2.4-dev15.tar.gz",
+    "version": "2.4-dev15"
   }
 }