[PR] chore: drop R support flags from Dockerfiles and CI workflow [texera]

["bobbai00 (via GitHub)" <gi...@apache.org>]

bobbai00 opened a new pull request, #4124:
URL: https://github.com/apache/texera/pull/4124

   ### What changes were proposed in this PR?
   
   This PR removes the `WITH_R_SUPPORT` build argument and all R-related installation logic from the Docker build configuration:
   
   1. **Dockerfiles** (`computing-unit-master.dockerfile` and `computing-unit-worker.dockerfile`):
      - Removed `ARG WITH_R_SUPPORT` build argument
      - Removed conditional R runtime dependencies installation
      - Removed R compilation and installation steps (R 4.3.3)
      - Removed R packages installation (arrow, coro, dplyr)
      - Removed `LD_LIBRARY_PATH` environment variable for R libraries
      - Removed `r-requirements.txt` copy in worker dockerfile
      - Simplified to Python-only dependencies
   
   2. **GitHub Actions Workflow** (`.github/workflows/build-and-push-images.yml`):
      - Removed `with_r_support` workflow input parameter
      - Removed `with_r_support` from job outputs and parameter passing
      - Removed `WITH_R_SUPPORT` build args from both AMD64 and ARM64 build steps
      - Removed R Support from build summary
   
   **Benefits:**
   - Simplified Docker images (smaller size, faster builds)
   - Reduced build complexity and maintenance burden
   - Removed unused feature per issue #4090 (Runtime R support was dropped)
   
   ### Any related issues, documentation, discussions?
   
   Related to #4090 - Drop Runtime Support for R-UDF
   
   ### How was this PR tested?
   
   - Verified Dockerfile syntax is valid
   - Confirmed all references to `WITH_R_SUPPORT` have been removed
   - CI workflow changes preserve existing build functionality for Python-based operators
   - Local testing: Docker build commands work correctly without the R support flag
   
   ### Was this PR authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) via Claude Code CLI


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Re: [PR] chore: drop R support flags from Dockerfiles and CI workflow [texera]

["bobbai00 (via GitHub)" <gi...@apache.org>]

bobbai00 merged PR #4124:
URL: https://github.com/apache/texera/pull/4124


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