[Automation] Add github actions for releasing

.github/workflows/auto_on_rel_published.yml

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+name: Auto on rel published
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  trigger_aas_release:
+    runs-on: windows-latest
+    env:
+      GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '7.0.101'
+
+      - name: "Get version following release"
+        id: versions
+        run: ./tracer/build.sh OutputCurrentVersionToGitHub
+
+      - name: "Close previous milestone"
+        run: .\tracer\build.ps1 CloseMilestone
+        env:
+          Version: ${{steps.versions.outputs.version}}
+

.github/workflows/auto_version_bump_merged.yml

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+name: "On Version Bump Merged"
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  if_merged:
+    if: github.event.pull_request.merged == true && startsWith(github.event.pull_request.title, '[Version Bump]') == true
+    runs-on: ubuntu-latest
+    steps:
+      # Create release branch
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '7.0.101'
+
+      - name: "Configure Git Credentials"
+        run: |
+          git config user.name "${{ github.actor }}"
+          git config user.email "${{ github.actor }}@users.noreply.github.com"
+
+      - name: "Get current version"
+        id: versions
+        run: ./github-actions-helpers/build.sh OutputCurrentVersionToGitHub
+
+      # Create release branch
+      - name: "Push ddtrace branch"
+        run: |
+          git checkout -b ddtrace-${{ steps.versions.outputs.version }}
+          git add .
+          git commit -m "New release ${{steps.versions.outputs.version}}"
+          git push origin -u ddtrace-${{ steps.versions.outputs.version }}
+
+      - name: "Generate release notes"
+        id: release_notes
+        run: ./github-actions-helpers/build.sh GenerateReleaseNotes
+        env:
+          PIPELINE_ARTIFACTS_LINK: ${{steps.assets.outputs.artifacts_link}}
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          name: "${{steps.versions.outputs.full_version}}"
+          tag_name: "${{steps.versions.outputs.full_version}}"
+          prerelease: ${{steps.versions.outputs.isprerelease}}
+          body: ${{steps.release_notes.outputs.release_notes}}
+          target_commitish: "ddtrace-${{steps.versions.outputs.full_version}}"
+          fail_on_unmatched_files: true

.github/workflows/create_version_bump_pr.yml

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+name: Version bump for next minor release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  bump_version:
+
+    runs-on: windows-latest
+    env:
+      GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+    steps:
+      - name: Support longpaths
+        run: git config --system core.longpaths true
+            echo "::set-output name=ref::master"
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: "Configure Git Credentials"
+        run: |
+          git config user.name "${{ github.actor }}"
+          git config user.email "${{ github.actor }}@users.noreply.github.com"
+
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '7.0.101'
+
+      - name: "CalculateNextVersion"
+        run: .\github-actions-helpers\build.ps1 CalculateNextVersion
+        id: versions
+
+      - name: "Bump Version"
+        run: .\github-actions-helpers\build.ps1 UpdateVersion
+        env:
+          NewVersion: ${{ steps.versions.outputs.version }}
+          NewIsPrerelease: ${{ steps.versions.outputs.isprerelease }}
+
+      - name: "Generate release notes"
+        id: release_notes
+        run: .\github-actions-helpers\build.ps1 GenerateReleaseNotes
+
+      - name: "Update Changelog"
+        run: .\github-actions-helpers\build.ps1 UpdateChangeLog
+        env:
+          RELEASE_NOTES: ${{steps.release_notes.outputs.release_notes}}
+
+      - name: "Verify Changes"
+        id: changes
+        run: .\github-actions-helpers\build.ps1 VerifyChangedFilesFromVersionBump
+
+      - name: Create Pull Request
+        id: pr
+        uses: peter-evans/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          branch: "version-bump-${{steps.versions.outputs.full_version}}"
+          commit-message: "[Version Bump] ${{steps.versions.outputs.full_version}}"
+          delete-branch: true
+          title: "[Version Bump] ${{steps.versions.outputs.full_version}}"
+          reviewers: "DataDog/apm-php"
+          body: "${{steps.changes.outputs.release_notes}}"
+
+      - name: Display output
+        run: |
+          echo "Pull Request Number - ${{ steps.pr.outputs.pull-request-number }}"
+          echo "Pull Request URL - ${{ steps.pr.outputs.pull-request-url }}"