Remove compile-extensions infrastructure from buildpacks CI

All Cloud Foundry buildpacks now use compile_extensions: false and
Go-based packaging, making the legacy Ruby gem-based compile-extensions
infrastructure obsolete.

This change removes:
- compile-extensions git resource from pipeline
- buildpack-packager GitHub release resource from pipeline
- update-compile-extensions job
- update-buildpack-packager job
- Legacy Ruby bundler packaging logic from buildpack-tagger.rb
- Hardcoded PHP v4.5.3 Gemfile download URLs
- compile_extensions field from all buildpack values files

Impact:
- 66 lines removed from pipeline.yml
- 30 lines removed from buildpack-tagger.rb
- 2 task files deleted (update-compile-extensions)
- 14 buildpack values files cleaned up

This completes the buildpack modernization effort, ensuring all
buildpacks use consistent Go-based tooling. PHP buildpack packaging
was modernized in cloudfoundry/php-buildpack#1200.

Related: cloudfoundry/php-buildpack#1200

Author: ramonskie

pipelines/buildpack/apt-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: ""
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 1

pipelines/buildpack/binary-values.yml

@@ -10,5 +10,4 @@ buildpack:
   product_slug: binary-buildpack
   skip_docker_start: true
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 1

pipelines/buildpack/config.yml

@@ -17,5 +17,4 @@ buildpack:
   product_slug: ""
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 1

pipelines/buildpack/dotnet-core-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: dotnet-core-buildpack
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 3

pipelines/buildpack/go-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: go-buildpack
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 3

pipelines/buildpack/hwc-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: hwc-buildpack
   skip_docker_start: false
   skip_brats: true
-  compile_extensions: false
   compute_instance_count: 1

pipelines/buildpack/nginx-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: nginx-buildpack
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 1

pipelines/buildpack/nodejs-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: nodejs-buildpack
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: false
   compute_instance_count: 1

pipelines/buildpack/php-values.yml

@@ -9,5 +9,4 @@ buildpack:
   product_slug: php-buildpack
   skip_docker_start: false
   skip_brats: false
-  compile_extensions: true
   compute_instance_count: 1

pipelines/buildpack/pipeline.yml

@@ -83,13 +83,6 @@ resources:
     source:
       uri: https://github.com/cloudfoundry/libbuildpack.git
 
-  #@ if data.values.buildpack.compile_extensions:
-  - name: compile-extensions
-    type: git
-    source:
-      uri: https://github.com/cloudfoundry/compile-extensions.git
-  #@ end
-
   #@ if data.values.language == "hwc":
   - name: buildpack-bosh-release
     type: git
@@ -132,15 +125,6 @@ resources:
       access_token: ((buildpacks-github-token))
   #@ end
 
-  #@ if data.values.buildpack.compile_extensions:
-  - name: buildpack-packager
-    type: github-release
-    source:
-      user: #@ data.values.buildpacks_github_org
-      repository: buildpack-packager
-      access_token: ((buildpacks-github-token))
-  #@ end
-
   #! S3 Buckets
   #@ for stack in data.values.buildpack.stacks:
   - name: #@ "pivotal-buildpack-" + stack
@@ -530,56 +514,6 @@ jobs:
           auto_merge: false
           base: master
 
-  #@ if data.values.buildpack.compile_extensions:
-  - name: update-compile-extensions
-    serial: true
-    public: true
-    plan:
-      - in_parallel:
-        - get: buildpacks-ci
-        - get: compile-extensions
-          trigger: true
-        - get: buildpack
-          resource: buildpack-master
-      - task: update-compile-extensions
-        file: buildpacks-ci/tasks/update-compile-extensions/task.yml
-        params:
-          RUBYGEM_MIRROR: #@ data.values.rubygem_mirror
-      - put: buildpack-pull-request
-        params:
-          repo_location: buildpack-artifacts
-          title: Update compile-extensions
-          branch_prefix: "update-compile-extensions"
-          auto_merge: false
-          base: master
-
-  - name: update-buildpack-packager
-    serial: true
-    public: true
-    plan:
-      - in_parallel:
-        - get: buildpacks-ci
-        - get: gem
-          resource: buildpack-packager
-          trigger: true
-        - get: repo-with-gemfile
-          resource: buildpack-master
-      - task: update-buildpack-packager
-        file: buildpacks-ci/tasks/update-gem-in-gemfile/task.yml
-        params:
-          RUBYGEM_MIRROR: #@ data.values.rubygem_mirror
-          GEM_NAME: buildpack-packager
-          GEM_GIT_REPOSITORY: #@ data.values.buildpack_packager_git_uri_public
-          GEMFILE_NAME: cf.Gemfile
-      - put: buildpack-pull-request
-        params:
-          repo_location: repo-with-gemfile-artifacts
-          title: Update buildpack-packager
-          branch_prefix: "update-buildpack-packager"
-          auto_merge: false
-          base: master
-  #@ end
-
   #@ if data.values.language == "hwc":
   - name: update-buildpack-bosh-release
     serial: true