Set STOPSIGNAL to WINCH for httpd's "graceful-stop"

See https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop for more details!

Closes #877

Author: tianon

7.1/buster/apache/Dockerfile

@@ -259,6 +259,9 @@ RUN { echo '#!/bin/sh'; echo 'exec pkg-config "$@" freetype2'; } > /usr/local/bi
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

7.1/stretch/apache/Dockerfile

@@ -256,6 +256,9 @@ COPY docker-php-ext-* docker-php-entrypoint /usr/local/bin/
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

7.2/buster/apache/Dockerfile

@@ -268,6 +268,9 @@ RUN { echo '#!/bin/sh'; echo 'exec pkg-config "$@" freetype2'; } > /usr/local/bi
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

7.2/stretch/apache/Dockerfile

@@ -277,6 +277,9 @@ RUN docker-php-ext-enable sodium
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

7.3/buster/apache/Dockerfile

@@ -268,6 +268,9 @@ RUN { echo '#!/bin/sh'; echo 'exec pkg-config "$@" freetype2'; } > /usr/local/bi
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

7.3/stretch/apache/Dockerfile

@@ -277,6 +277,9 @@ RUN docker-php-ext-enable sodium
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

7.4-rc/buster/apache/Dockerfile

@@ -269,6 +269,9 @@ RUN docker-php-ext-enable sodium
 
 ENTRYPOINT ["docker-php-entrypoint"]
 ##<autogenerated>##
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html
 

apache-Dockerfile-block-2

@@ -1,3 +1,6 @@
+# https://httpd.apache.org/docs/2.4/stopping.html#gracefulstop
+STOPSIGNAL WINCH
+
 COPY apache2-foreground /usr/local/bin/
 WORKDIR /var/www/html