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:recycle: Revert Dockerfile changes, keep only Makefile improvements

Based on maintainer feedback, reverting the Dockerfile and .dockerignore changes
to focus solely on the Makefile install/uninstall improvements. The Dockerfile
issue will be addressed separately with a dynamic approach where COPY directives
are added incrementally as components are created.

This commit:
- Reverts Dockerfile to original state with specific COPY directives
- Reverts .dockerignore to minimal configuration
- Keeps the improved Makefile install/uninstall targets that handle empty CRD directories
- Updates all samples and testdata with the reverted templates