add inotify

Dockerfile

@@ -14,7 +14,8 @@ RUN apk --no-cache add \
     bzip2-dev \
     xz-dev \
     lz4-dev \
-    icu-dev
+    icu-dev \
+    inotify-tools-dev
 
 RUN mkdir /tmp/dovecot
 RUN wget -qO- https://www.dovecot.org/releases/2.3/dovecot-2.3.0.tar.gz | tar -xz -C /tmp/dovecot --strip 2
@@ -24,6 +25,7 @@ RUN wget -qO- https://pigeonhole.dovecot.org/releases/2.3/dovecot-2.3-pigeonhole
 
 RUN cd /tmp/dovecot && \
     ./configure --prefix '' \
+    --with-notify=inotify \
     --with-lua \
     --with-zlib \
     --with-bzlib \
@@ -71,7 +73,8 @@ RUN apk --no-cache add \
     ssmtp \
     ca-certificates \
     lua \
-    lua-ldap
+    lua-ldap \
+    inotify-tools
 
 RUN addgroup -g 150 dovecot
 RUN adduser -u 140 -h /dev/null -H -s /sbin/nologin -D -G dovecot dovecot