fix: fix alpine version to 3.18.5 in iipsrv

Fix #1118
- alpine:3.19.0 does not work because of a missing library (libwebpmux.so)

iipsrv/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine AS builder
+FROM alpine:3.18.5 AS builder
 
 RUN apk add --no-cache \
   autoconf \
@@ -15,7 +15,7 @@ RUN ./autogen.sh
 RUN ./configure --enable-openjpeg
 RUN make
 
-FROM alpine
+FROM alpine:3.18.5
 
 RUN apk add --no-cache \
   libgcc \
@@ -34,4 +34,4 @@ ENV PORT 9003
 
 EXPOSE ${PORT}
 
-ENTRYPOINT /fcgi-bin/iipsrv.fcgi --bind 0.0.0.0:${PORT}
+ENTRYPOINT /fcgi-bin/iipsrv.fcgi --bind 0.0.0.0:${PORT}