Add utility script 'dip.sh' (#12147)

Adds a useful script for printing out the IP addresses
of currently running docker containers.

.docker/dip.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+#
+# dip - Displays an equivalent of 'docker container ls' but
+#       also with IP addresses.
+#
+# Source this file, then can invoke command "dip"
+#
+#
+# Example Output:
+#
+# NAMES                        ┊IP        ┊STATUS                 ┊SIZE
+# triplea-database-1           ┊172.20.0.2┊Up 34 minutes (healthy)┊63B (virtual 202MB)
+# triplea-game-support-server-1┊172.20.0.4┊Up 20 minutes          ┊32.8kB (virtual 241MB)
+# triplea-lobby-1              ┊172.20.0.3┊Up 20 minutes          ┊32.8kB (virtual 244MB)
+# triplea-nginx-1              ┊172.20.0.5┊Up 20 minutes          ┊2B (virtual 58.5MB)
+#
+
+docker_ps="$(
+  docker ps --format 'table{{.Names}}|{{.Status}}|{{.Size}}' |
+    tail --lines +2 |
+    sort
+)"
+
+# https://stackoverflow.com/a/20686101
+FORMAT='{{.Name}}|{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}'
+
+ip_addresses=$(
+  echo "$docker_ps" |
+    cut --fields 1 --delimiter '|' |
+    while read -r container; do
+      docker inspect --format=$FORMAT "$container"
+    done |
+    sed 's|^/||' |
+    sort
+)
+
+{
+  FM="\033[1m%s\033[0m|\033[1m%s\033[0m|\033[1m%s\033[0m|\033[1m%s\033[0m"
+  printf "$FM\n" NAMES IP STATUS SIZE
+  join -t "|" <(echo "$ip_addresses") <(echo "$docker_ps")
+} |
+  column --separator "|" --output-separator "┊" --table