doc/developer-utils: added helper script for easily creating szurubooru migrations

doc/developer-utils/create-alembic-migration.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+# Helper script to create an alembic migration file via Docker
+
+if [ $# -lt 1 ]; then
+    echo "Need to pass a name for your migration file" > /dev/stderr
+    exit 1
+fi
+
+# Create a dummy container
+WORKDIR="$(git rev-parse --show-toplevel)/server"
+IMAGE=$(docker build -q "${WORKDIR}")
+CONTAINER=$(docker run -d ${IMAGE} tail -f /dev/null)
+
+# Create the migration script
+docker exec -i \
+	-e PYTHONPATH='/opt/app' \
+	-e POSTGRES_HOST='x' \
+	-e POSTGRES_USER='x' \
+	-e POSTGRES_PASSWORD='x' \
+	${CONTAINER} alembic revision -m "$1"
+
+# Copy the file over from the container
+docker cp ${CONTAINER}:/opt/app/szurubooru/migrations/versions/ \
+	"${WORKDIR}/szurubooru/migrations/"
+
+# Destroy the dummy container
+docker rm -f ${CONTAINER} > /dev/null