Signing and verification added, release notes generation automated

[rcmadhankumar]

Signing and verification added for imgpkg artifacts.
Release notes generation automated for Installation and signature verification.

Release notes will look like:

✨ What's new

• a2bcf24 fix

Full Changelog: rcmadhankumar/imgpkg@v0.0.29...v0.0.34

Installation and signature verification

Installation

By downloading binary from the release

For instance, if you are using Linux on an AMD64 architecture:

# Download the binary
curl -LO https://github.com/rcmadhankumar/imgpkg/releases/download/v0.0.34/imgpkg-linux-amd64

# Move the binary in to your PATH
mv imgpkg-linux-amd64 /usr/local/bin/imgpkg

# Make the binary executable
chmod +x /usr/local/bin/imgpkg

Via Homebrew (macOS or Linux)

$ brew tap carvel-dev/carvel
$ brew install imgpkg
$ imgpkg version

Verify checksums file signature

Install cosign on your system https://docs.sigstore.dev/system_config/installation/

The checksums file provided within the artifacts attached to this release is signed using Cosign with GitHub OIDC. To validate the signature of this file, run the following commands:

# Download the checksums file, certificate and signature
curl -LO https://github.com/rcmadhankumar/imgpkg/releases/download/v0.0.34/checksums.txt
curl -LO https://github.com/rcmadhankumar/imgpkg/releases/download/v0.0.34/checksums.txt.pem
curl -LO https://github.com/rcmadhankumar/imgpkg/releases/download/v0.0.34/checksums.txt.sig

# Verify the checksums file
cosign verify-blob checksums.txt \
  --certificate checksums.txt.pem \
  --signature checksums.txt.sig \
  --certificate-identity-regexp=https://github.com/rcmadhankumar \
  --certificate-oidc-issuer=https://token.actions.githubusercontent.com

Verify binary integrity

To verify the integrity of the downloaded binary, you can utilize the checksums file after having validated its signature.

# Verify the binary using the checksums file
sha256sum -c checksums.txt --ignore-missing

📂 Files Checksum

35a8c6ac2509288c2296a1da6057d182b1b277e3bf59ed8b6d01222fa910058d  ./imgpkg-darwin-arm64
41ddfa974219cb846fe7ae6fa142e3f1a9a19c28ac63c25ea2ac3cb235b4542f  ./imgpkg-darwin-amd64
97762f9e9cc1b7edab7fe464c1eec7635beea64990394a64fb1d17f6ec7b9528  ./imgpkg-windows-amd64.exe
9e3b9c8faabb0b5917191b2e2a571e7d5f7e8851b43887b5978524c35ef31f49  ./imgpkg-linux-amd64
ccdf4aff8cc088f70f6bff28620c6f1c760e2c6188ab8211f9e5444970ad3280  ./imgpkg-linux-arm64

[kumaritanushree]

LGTM