get swag in goreleaser.yml

.goreleaser.yml

@@ -17,6 +17,7 @@ before:
     - python3 mail/generate.py -y
     - python3 version.py {{.Version}} version.go
     - bash -c 'npx esbuild ts/* --outdir=data/static --minify'
+    - go get -u github.com/swaggo/swag/cmd/swag
     - swag init -g main.go
 builds:
     - dir: ./