Refactor the httpd images a bit.

- Use the environment variables (like APACHE_RUN_USER or APACHE_LOG_DIR)
  during the build, so now they're set earlier.
- Add the APACHE_LOCK_DIR.

httpd/bullseye/Dockerfile

 FROM registry.hub.docker.com/library/debian:bullseye-slim
+ENV APACHE_RUN_DIR=/run/apache2 \
+    APACHE_LOCK_DIR=/var/lock/apache2 \
+    APACHE_LOG_DIR=/var/log/apache2 \
+    APACHE_RUN_USER=www-data \
+    APACHE_RUN_GROUP=www-data \
+    APACHE_PID_FILE=/run/apache2/apache2.pid
 # hadolint ignore=DL3008,DL3015
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y \
@@ -9,17 +15,13 @@ RUN apt-get update && \
     setcap CAP_NET_BIND_SERVICE=+ep /usr/sbin/apache2 && \
     DEBIAN_FRONTEND=noninteractive apt-get purge --auto-remove -y libcap2-bin && \
     a2enmod status && \
-    install -d -o www-data -g www-data -m 755 /run/apache2 && \
-    install -d -o www-data -g www-data -m 755 /var/log/apache2 && \
-    ln -sf /dev/stdout /var/log/apache2/access.log && \
-    ln -sf /dev/stderr /var/log/apache2/error.log && \
-    ln -sf /dev/stdout /var/log/apache2/other_vhosts_access.log && \
+    install -d -o "$APACHE_RUN_USER" -g "$APACHE_RUN_GROUP" -m 755 "$APACHE_RUN_DIR" && \
+    install -d -o "$APACHE_RUN_USER" -g "$APACHE_RUN_GROUP" -m 755 "$APACHE_LOCK_DIR" && \
+    install -d -o "$APACHE_RUN_USER" -g "$APACHE_RUN_GROUP" -m 755 "$APACHE_LOG_DIR" && \
+    ln -sf /dev/stdout "$APACHE_LOG_DIR/access.log" && \
+    ln -sf /dev/stderr "$APACHE_LOG_DIR/error.log" && \
+    ln -sf /dev/stdout "$APACHE_LOG_DIR/other_vhosts_access.log" && \
     rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/* /var/cache/apt/archives/*
-ENV APACHE_RUN_DIR=/run/apache2 \
-    APACHE_LOG_DIR=/var/log/apache2 \
-    APACHE_RUN_USER=www-data \
-    APACHE_RUN_GROUP=www-data \
-    APACHE_PID_FILE=/run/apache2/apache2.pid
 RUN apache2 -t
 EXPOSE 80
 CMD [ "apache2", "-DFOREGROUND" ]

httpd/buster/Dockerfile

 FROM registry.hub.docker.com/library/debian:buster-slim
+ENV APACHE_RUN_DIR=/run/apache2 \
+    APACHE_LOCK_DIR=/var/lock/apache2 \
+    APACHE_LOG_DIR=/var/log/apache2 \
+    APACHE_RUN_USER=www-data \
+    APACHE_RUN_GROUP=www-data \
+    APACHE_PID_FILE=/run/apache2/apache2.pid
 # hadolint ignore=DL3008,DL3015
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y \
@@ -9,17 +15,13 @@ RUN apt-get update && \
     setcap CAP_NET_BIND_SERVICE=+ep /usr/sbin/apache2 && \
     DEBIAN_FRONTEND=noninteractive apt-get purge --auto-remove -y libcap2-bin && \
     a2enmod status && \
-    install -d -o www-data -g www-data -m 755 /run/apache2 && \
-    install -d -o www-data -g www-data -m 755 /var/log/apache2 && \
-    ln -sf /dev/stdout /var/log/apache2/access.log && \
-    ln -sf /dev/stderr /var/log/apache2/error.log && \
-    ln -sf /dev/stdout /var/log/apache2/other_vhosts_access.log && \
+    install -d -o "$APACHE_RUN_USER" -g "$APACHE_RUN_GROUP" -m 755 "$APACHE_RUN_DIR" && \
+    install -d -o "$APACHE_RUN_USER" -g "$APACHE_RUN_GROUP" -m 755 "$APACHE_LOCK_DIR" && \
+    install -d -o "$APACHE_RUN_USER" -g "$APACHE_RUN_GROUP" -m 755 "$APACHE_LOG_DIR" && \
+    ln -sf /dev/stdout "$APACHE_LOG_DIR/access.log" && \
+    ln -sf /dev/stderr "$APACHE_LOG_DIR/error.log" && \
+    ln -sf /dev/stdout "$APACHE_LOG_DIR/other_vhosts_access.log" && \
     rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/* /var/cache/apt/archives/*
-ENV APACHE_RUN_DIR=/run/apache2 \
-    APACHE_LOG_DIR=/var/log/apache2 \
-    APACHE_RUN_USER=www-data \
-    APACHE_RUN_GROUP=www-data \
-    APACHE_PID_FILE=/run/apache2/apache2.pid
 RUN apache2 -t
 EXPOSE 80
 CMD [ "apache2", "-DFOREGROUND" ]