* feat(ci): docker linting
adds hadolint to validate dockerfile best practices
configures project-specific rules in .hadolint.yaml
* fix(ci): enable hadolint console output
adds verbose and tty format to see linting results in CI logs
* test: trigger hadolint warning
remove --no-install-recommends to test CI output
* fix(ci): fail hadolint on warnings
stricter linting to catch all best practice violations
* fix: add --no-install-recommends to apt-get
reduces image size by avoiding unnecessary packages
* refactor: use WORKDIR instead of cd in dockerfile
replaces cd commands with WORKDIR for cleaner dockerfile
removes unnecessary hadolint ignore rules DL3003 and DL3009
* chore: simplify hadolint config
removes unnecessary override rules for cleaner config
