Add migrations support

root/etc/cont-init.d/01-migrations

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+MIGRATIONS_DIR="/migrations"
+MIGRATIONS_HISTORY="/config/.migrations"
+
+echo "[migrations] started"
+
+if [ ! -d $MIGRATIONS_DIR ]; then
+  echo "[migrations] no migrations found"
+  exit
+fi
+
+for MIGRATION in $(ls -1 ${MIGRATIONS_DIR}/* | sort -n); do
+  NAME="$(basename "${MIGRATION}")"
+  if [ -f $MIGRATIONS_HISTORY ] && grep -Fxq "$NAME" $MIGRATIONS_HISTORY; then
+    echo "[migrations] ${NAME}: skipped"
+    continue
+  fi
+  echo "[migrations] ${NAME}: executing..."
+  chmod +x $MIGRATION
+  EXIT_CODE=$(/bin/bash ${MIGRATION}; echo $?)
+  if [ $EXIT_CODE -ne 0 ]; then
+    echo "[migrations] ${NAME}: failed with exit code $EXIT_CODE, contact support"
+    exit $EXIT_CODE
+  fi
+  echo $NAME >> $MIGRATIONS_HISTORY
+  echo "[migrations] ${NAME}: succeeded"
+done
+
+echo "[migrations] done"