Add files to automatically generate maps with Docker

Signed-off-by: zyphlar <zyphlar@gmail.com>

tools/unix/update_planet.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+
+OSMUPDATE=~/osmctools/osmupdate
+# osmconvert should be accessible in PATH.
+PATH="$(dirname "$OSMUPDATE"):$PATH"
+
+# Pass pbf or o5m file as a parameter
+OLD="$1"
+NEW="${1/.pbf/.new.pbf}"
+NEW="${NEW/.o5m/.new.o5m}"
+
+"$OSMUPDATE" -v --drop-authors --drop-version --hash-memory=512000 "$OLD" "$NEW"
+# Uncomment to replace old planet.
+mv "$NEW" "$OLD"
+#md5sum -b "$OLD" > "$OLD.md5"
+echo "Successfully updated $OLD"