add experiments as composite actions

Author: jprinet

.github/composite/README.md

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+# Composite Github Actions
+
+The composite actions provided here will simplify running the validation scripts in your Github Action workflow.
+
+## Usage
+
+Create a Github Action workflow, fulfilling the build requirements (add JDK...) and then add the following steps (replacing the placeholders):
+
+```yaml
+steps:
+  - uses: gradle/gradle-enterprise-build-validation-scripts/.github/composite/[email protected]
+  - uses: gradle/gradle-enterprise-build-validation-scripts/.github/composite/[email protected]
+    with:
+      repositoryUrl: <PROJECT_GIT_URL>
+      branch: <PROJECT_BRANCH>
+      task: <PROJECT_BUILD_TASK>
+      gradleEnterpriseUrl: <GRADLE_ENTERPRISE_URL>
+  - uses: gradle/gradle-enterprise-build-validation-scripts/.github/composite/[email protected]
+    with:
+      repositoryUrl: <PROJECT_GIT_URL>
+      branch: <PROJECT_BRANCH>
+      task: <PROJECT_BUILD_TASK>
+      gradleEnterpriseUrl: <GRADLE_ENTERPRISE_URL>
+  - uses: gradle/gradle-enterprise-build-validation-scripts/.github/composite/[email protected]
+    with:
+      repositoryUrl: <PROJECT_GIT_URL>
+      branch: <PROJECT_BRANCH>
+      task: <PROJECT_BUILD_TASK>
+      gradleEnterpriseUrl: <GRADLE_ENTERPRISE_URL>
+```
+
+You can then navigate the workflow output and click the investigation links provided by the script.

.github/composite/exp1/action.yml

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+name: Run experiment 1
+
+inputs:
+  repositoryUrl:
+    required: true
+    type: string
+  branch:
+    required: true
+    type: string
+  task:
+    required: true
+    type: string
+  gradleEnterpriseUrl:
+    required: true
+    type: string
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run Gradle Experiment 1
+      run: |
+        cd gradle-enterprise-gradle-build-validation
+        ./01-validate-incremental-building.sh -r ${{ inputs.repositoryUrl }} -b ${{ inputs.branch }} -t ${{ inputs.task }} -s ${{ inputs.gradleEnterpriseUrl }}
+      shell: bash

.github/composite/exp2/action.yml

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+name: Run experiment 2
+
+inputs:
+  repositoryUrl:
+    required: true
+    type: string
+  branch:
+    required: true
+    type: string
+  task:
+    required: true
+    type: string
+  gradleEnterpriseUrl:
+    required: true
+    type: string
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run Gradle Experiment 2
+      run: |
+        cd gradle-enterprise-gradle-build-validation
+        ./02-validate-local-build-caching-same-location.sh -r ${{ inputs.repositoryUrl }} -b ${{ inputs.branch }} -t ${{ inputs.task }} -s ${{ inputs.gradleEnterpriseUrl }}
+      shell: bash

.github/composite/exp3/action.yml

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+name: Run experiment 3
+
+inputs:
+  repositoryUrl:
+    required: true
+    type: string
+  branch:
+    required: true
+    type: string
+  task:
+    required: true
+    type: string
+  gradleEnterpriseUrl:
+    required: true
+    type: string
+
+runs:
+  using: "composite"
+  steps:
+    - name: Run Gradle Experiment 3
+      run: |
+        cd gradle-enterprise-gradle-build-validation
+        ./03-validate-local-build-caching-different-locations.sh -r ${{ inputs.repositoryUrl }} -b ${{ inputs.branch }} -t ${{ inputs.task }} -s ${{ inputs.gradleEnterpriseUrl }}
+      shell: bash

.github/composite/getLatest/action.yml

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+name: Get latest release
+
+runs:
+  using: "composite"
+  steps:
+    - name: Get latest release
+      run: |
+        downloadUrl=$(curl -s https://api.github.com/repos/gradle/gradle-enterprise-build-validation-scripts/releases/latest | jq -c '.assets[] | select(.content_type == "application/zip")' | jq -r .browser_download_url | grep -v maven)
+        curl -s -L -o gradle-enterprise-gradle-build-validation.zip $downloadUrl
+        unzip -q -o gradle-enterprise-gradle-build-validation.zip
+      shell: bash