chore: automate release workflow

Signed-off-by: Pranshu Srivastava <[email protected]>

.github/workflows/release.yml

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+# Run on tag push.
+# Note: Additionally, create the release branch.
+on:
+  push:
+    tags:
+      - v*
+
+permissions:
+  contents: read
+
+env:
+  GO_VERSION: "^1.21"
+  GOLANGCI_LINT_VERSION: "v1.54.2"
+  E2E_SETUP_KIND: yes
+  E2E_SETUP_KUBECTL: yes
+
+jobs:
+  release:
+    strategy:
+      matrix:
+        go-version: [${{ env.GO_VERSION }}, "latest"]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout into the repository in a new branch
+        uses: actions/checkout@v4
+        with:
+          ref: release-${{ github.ref }}
+          repository: ${{ github.event.repository.full_name }}
+      - name: Set up the Go@${{ matrix.go-version }} environment
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Install tools
+        run: make install-tools
+      - name: Get the pushed tag
+        id: get_tag
+        run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
+      - name: Update the VERSION manifest to the pushed tag
+        run: echo "${{ steps.get_tag.outputs.tag }}" > VERSION
+      - name: Update the compatibility matrix (README.md)
+        run: ./scripts/update-compatibility-matrix.sh
+      - name: Generate the release notes (CHANGELOG.md)
+        run: ./scripts/generate-release-notes.sh
+      - name: Lint
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin ${{ env.GOLANGCI_LINT_VERSION }}
+          make lint-fix
+      - name: Generate manifests
+        run: make examples
+      - name: Validate manifests
+        run: make validate-manifests
+      - name: Validate docs
+        run: make validate-docs
+      - name: Validate go modules
+        run: make validate-modules
+      - name: Run rule tests
+        run: PROMTOOL_CLI=./promtool make install-promtool test-rules
+      - name: Run unit tests
+        run: make test-unit
+      - name: Benchmark tests
+        run: make test-benchmark-compare
+      - name: Run end-to-end tests
+        run: make e2e
+      - name: Commit the changes
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "KSM Release Bot"
+          git add .
+          git commit -m "chore: Cut ${{ steps.get_tag.outputs.tag }}"
+      - name: Create a pull request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: Cut ${{ steps.get_tag.outputs.tag }}"
+          title: "chore: Cut ${{ steps.get_tag.outputs.tag }}"
+          body: "This PR was automatically created by the release workflow."
+          branch: release-${{ steps.get_tag.outputs.tag }}
+          base: release-${{ steps.get_tag.outputs.tag }}
+          reviewers: "sig-instrumentation-approvers"
+          assignees: "sig-instrumentation-leads"
+          draft: false

scripts/generate-release-notes.sh

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+#!/bin/bash
+
+# Fetch the latest two tags.
+# NOTE: This assumes a patch release for an older release is not made after a later minor release (which is the case right now).
+# Backports will be handled manually, on a case-by-case basis.
+last_two_tags=$(git tag --sort=-creatordate | head -n 2)
+IFS=$'\n' read -d '' -r -a tags <<< "$last_two_tags"
+commits=$(git log --pretty=format:"%h: %an <%ae>: %s" "${tags[1]}".."${tags[0]}" | grep -i -v -e 'fixup' -e 'merge' -e 'dependabot')
+
+# Update the changelog with the latest release notes.
+echo -e "## ${tags[0]}\n\n$commits\n$(cat CHANGELOG.md)" > CHANGELOG.md

scripts/update-compatibility-matrix.sh

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+#!/bin/bash
+
+# Fetch the latest tag
+latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
+
+# Determine if it's a minor or patch release
+if [[ $latest_tag =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+    IFS='.' read -ra TAG <<< "$latest_tag"
+    if [[ ${#TAG[@]} -eq 2 ]]; then
+        # Prep for a minor release.
+        client_go_version=$(awk '/\| \*\*main\*\*/ {print $4}' README.md)
+        sed -i "/| \*\*main\*\*           | $client_go_version |/i| \*\*$latest_tag\*\*         | $client_go_version |\n| \*\*main\*\*           | $client_go_version |" README.md
+        oldest_supported_client_go_version=$(awk 'NR==2 {print $4; exit}' README.md)
+        # Remove the first row
+        sed -i "/| \*\*.*\*\*         | $oldest_supported_client_go_version |/d" README.md
+    elif [[ ${#TAG[@]} -eq 3 ]]; then
+        # Prep for a patch release.
+        minor_release="${TAG[0]}.${TAG[1]}"
+        # Get the client-go version of the minor release row
+        client_go_version=$(awk -v release="| \*\*$minor_release.*\*\*" '$0 ~ release {print $4}' README.md)
+        # Update the row with the latest tag and client-go version
+        sed -i "s/| \*\*$minor_release.*\*\*         | $client_go_version |/| \*\*$latest_tag\*\*         | $client_go_version |/" README.md
+    else
+        echo "Bad tag format: $latest_tag, expected one of the following formats: \
+          * vMAJOR.MINOR (minor release) \
+          * vMAJOR.MINOR.PATCH (patch release)"
+        exit 1
+    fi
+else
+    echo "Bad tag format: $latest_tag, expected one of the following formats: \
+      * vMAJOR.MINOR (minor release) \
+      * vMAJOR.MINOR.PATCH (patch release)"
+    exit 1
+fi