ci pipeline for release page

[j75689]

Description

Publish new release page when the new tag was push

Rationale

N/A

Example

New workflow:

1. update changelog into CHANGELOG.md
2. update the version name of params/version.go
3. make a new tag from the master branch
4. push tag

Notice
Please make sure CHANGELOG.md contains the tag with format ## v...(ex: ## v1.1.2)
And ci pipeline will get the content below the tag as release body.

Addition
If you want to change mainnet.zip or testnet.zip, please update the download URL to .github/release.env with the name MAINNET_FILE_URL and TESTNET_FILE_URL.

Example of a release page made by ci: https://github.com/j75689/bsc/releases/tag/v1.1.2

Changes

Notable changes:

• add .github/generate_change_log.sh
• add .github/release.env
• add .github/workflows/release.yml

Preflight checks

• build passed (make build)
• tests passed (make test)
• manual transaction test passed

Already reviewed by

N/A

Related issues

N/A