[installer]: change db-migration command

The "migrations" command is now deprecated, replaced in favour of
"migration". Also added in the "show" command to display the migration
files that will show the migrations that will be applied.

Author: Simon Emms

installer/pkg/components/migrations/job.go

@@ -45,7 +45,7 @@ func job(ctx *common.RenderContext) ([]runtime.Object, error) {
 						Command: []string{
 							"sh",
 							"-c",
-							"cd /app/node_modules/@gitpod/gitpod-db && yarn run wait-for-db && yarn run typeorm migrations:run",
+							"cd /app/node_modules/@gitpod/gitpod-db && yarn run wait-for-db && yarn run typeorm migration:show || true && yarn run typeorm migration:run",
 						},
 					}},
 				},