[2241] Fix path to valid_images.json

[pavannd1]

Change Overview

The push_images.sh script is executed from the root directory. Requires build/valid_images.json to be able to get the image list. This has been failing silently for a while now.

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Issues

• fixes [BUG] CI failed to push Kanister Container Images to GHCR #2241

Test Plan

• 💪 Manual
  Changed docker push to echo to print the list
  Before:

./build/push_images.sh
cat: valid_images.json: No such file or directory
./build/push_images.sh: line 31: IMAGES[@]: unbound variable

After:

./build/push_images.sh
ghcr.io/kanisterio/mysql-sidecar:v9.99.9-dev
ghcr.io/kanisterio/kafka-adobe-s3-sink-connector:v9.99.9-dev
ghcr.io/kanisterio/postgres-kanister-tools:v9.99.9-dev
ghcr.io/kanisterio/postgresql:v9.99.9-dev
ghcr.io/kanisterio/cassandra:v9.99.9-dev
ghcr.io/kanisterio/kanister-kubectl-1.18:v9.99.9-dev
ghcr.io/kanisterio/mongodb:v9.99.9-dev
ghcr.io/kanisterio/es-sidecar:v9.99.9-dev
ghcr.io/kanisterio/controller:v9.99.9-dev
ghcr.io/kanisterio/kanister-tools:v9.99.9-dev
ghcr.io/kanisterio/kafka-adobe-s3-source-connector:v9.99.9-dev
ghcr.io/kanisterio/mssql-tools:v9.99.9-dev

• ⚡ Unit test
• 💚 E2E

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[mellon-collie]

@pavannd1 Thanks for catching this!