[ci] remove Ubuntu 14.04 image (#32)

* [ci] fix Java installation in Ubuntu 14.04 image

* reorganize

.github/CODEOWNERS

@@ -0,0 +1,5 @@
+# See https://help.github.com/en/articles/about-code-owners
+# for details
+
+# catch-all rule (this only gets matched if no rules below match)
+*    @guolinke @jameslamb

.github/workflows/publish_image.yml

@@ -16,8 +16,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - docker_image: ubuntu-14.04
-            arch: linux/amd64
           - docker_image: manylinux2014_aarch64
             arch: linux/arm64
           - docker_image: manylinux_2_28_x86_64
@@ -44,7 +42,7 @@ jobs:
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
-          context: ${{ github.workspace }}/dockers/${{ matrix.docker_image }}/
+          context: ${{ github.workspace }}/images/${{ matrix.docker_image }}/
           push: true
           platforms: ${{ matrix.arch }}
           tags: lightgbm/vsts-agent:${{ steps.tag.outputs.docker_tag }}

.gitignore

@@ -0,0 +1,53 @@
+*.7zip
+*.a
+*.bak
+build/
+*.bz
+*.core
+*.coverage
+*.css
+*.csv
+*.dat
+*.db
+dist/
+*.dll
+*.doc
+*.docx
+*.docm
+.DS_Store
+*.dylib
+*.egg-info/
+*.env
+*.exe
+*.feather
+*.html
+htmlcov/
+.idea/
+*.js
+*.json
+.mypy_cache/
+*.npy
+*.o
+*.pdf
+*.pem
+*.ppt
+*.pptx
+*.pptm
+*.pq
+*.pub
+*.pyc
+__pycache__/
+.pytest_cache/
+*.rsa
+_skbuild/
+*.snappy-*.tar.gz
+*.so
+*.sqlite
+*.tar.gz
+*.tgz
+*.tmp
+*.whl
+*.xls
+*.xlsx
+*.xlsm
+*.zip

README.md

@@ -1,3 +1,5 @@
 # lightgbm-ci-docker
 
-This project is used to build container images that can be used to test LightGBM in operating systems not supported by continuous integration services.
+This project is used to build container images for use in continuous integration at https://github.com/microsoft/LightGBM.
+
+See https://hub.docker.com/repository/docker/lightgbm/vsts-agent/tags.