Create docker-entrypoint.sh

docker-entrypoint.sh

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+#!/bin/sh
+set -e
+
+# this if will check if the first argument is a flag
+# but only works if all arguments require a hyphenated flag
+# -v; -SL; -f arg; etc will work, but not arg1 arg2
+if [ "$#" -eq 0 ] || [ "${1#-}" != "$1" ]; then
+    set -- radiusd "$@"
+fi
+
+# check for the expected command
+if [ "$1" = 'radiusd' ]; then
+    shift
+    exec radiusd -f "$@"
+fi
+
+# debian people are likely to call "freeradius" as well, so allow that
+if [ "$1" = 'freeradius' ]; then
+    shift
+    exec radiusd -f "$@"
+fi
+
+# else default to run whatever the user wanted like "bash" or "sh"
+exec "$@"