Update readme with manual deployment instructions

README.md

@@ -101,3 +101,19 @@ docker-compose up
 | SFTP Key Auth             | localhost:2221            | **Private Key:** [key_with_passphrase](./playground/ssh/key_with_passphrase) / [key_without_passphrase](./playground/ssh/key_without_passphrase) |
 | SFTP Basic and Key Auth   | localhost:2222            | **Private Key:** [key_with_passphrase](./playground/ssh/key_with_passphrase) / [key_without_passphrase](./playground/ssh/key_without_passphrase)   |
 | SFTP Exporter             | http://localhost:8081     | **User:** foo **Password:** password **Private Key:** [key_with_passphrase](./playground/ssh/key_with_passphrase) / [key_without_passphrase](./playground/ssh/key_without_passphrase) |
+
+## Deployment
+
+1. Create tag
+2. Release using goreleaser
+
+```shell
+export GITHUB_TOKEN=<token>
+goreleaser --clean
+```
+
+3. Push docker image
+
+```
+docker build -t arunvelsriram/sftp-exporter:<version> .
+```