Add autobump script

Author: robbie-c

.github/workflows/label-version-bump.yml

@@ -0,0 +1,89 @@
+name: Autobump
+
+on:
+    pull_request:
+        types: [closed]
+
+jobs:
+    label-version-bump:
+        name: Bump version based on PR label
+        runs-on: ubuntu-20.04
+        if: |
+            github.event.pull_request.merged
+            && (
+                contains(github.event.pull_request.labels.*.name, 'bump patch')
+                || contains(github.event.pull_request.labels.*.name, 'bump minor')
+                || contains(github.event.pull_request.labels.*.name, 'bump major')
+            )
+        steps:
+            - name: Check out repository
+              uses: actions/checkout@v4
+              with:
+                  ref: ${{ github.event.pull_request.base.ref }}
+                  token: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN }}
+                  fetch-depth: 0
+
+            - uses: pnpm/action-setup@v4
+              with:
+                version: 8.x.x
+
+            - name: Set up Rust
+              run: |
+                rustup update stable
+                rustup default stable
+
+            - name: Install cargo-edit
+              run: cargo install cargo-edit
+
+            - name: Detect version bump type
+              id: bump-type
+              run: |
+                  BUMP_TYPE=null
+                  if [[ $BUMP_PATCH_PRESENT == 'true' ]]; then
+                      BUMP_TYPE=patch
+                  fi
+                  if [[ $BUMP_MINOR_PRESENT == 'true' ]]; then
+                      BUMP_TYPE=minor
+                  fi
+                  if [[ $BUMP_MAJOR_PRESENT == 'true' ]]; then
+                      BUMP_TYPE=major
+                  fi
+                  echo "bump-type=$BUMP_TYPE" >> "$GITHUB_OUTPUT"
+              env:
+                  BUMP_PATCH_PRESENT: ${{ contains(github.event.pull_request.labels.*.name, 'bump patch') }}
+                  BUMP_MINOR_PRESENT: ${{ contains(github.event.pull_request.labels.*.name, 'bump minor') }}
+                  BUMP_MAJOR_PRESENT: ${{ contains(github.event.pull_request.labels.*.name, 'bump major') }}
+
+            - name: Determine new version
+              id: versions
+              if: steps.bump-type.outputs.bump-type != 'null'
+              run: |
+                  NEW_VERSION=$(npx semver $OLD_VERSION -i ${{ steps.bump-type.outputs.bump-type }})
+                  echo "old-version=$OLD_VERSION" >> "$GITHUB_OUTPUT"
+                  echo "new-version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+
+            - name: Update version in cargo.toml
+              if: steps.bump-type.outputs.bump-type != 'null'
+              run: |
+                  OLD_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[] | select(.name == "posthog-rs") | .version')
+                  cargo set-version --bump ${{ steps.bump-type.outputs.bump-type }}
+                  NEW_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[] | select(.name == "posthog-rs") | .version')
+
+            - name: Update CHANGELOG.md
+              run: |
+                  CHANGELOG_HEADING='## ${{ steps.versions.outputs.new-version }} - '$(date --iso-8601)
+                  CHANGELOG_POINTS=$(git log v${{ steps.versions.outputs.old-version }}..${{ github.event.pull_request.base.ref }} --pretty=format:%s --grep='^.*\d*)$' | sed -e 's/^/- /')
+                  mv CHANGELOG.md CHANGELOG.old.md
+                  echo -e "$CHANGELOG_HEADING\n\n$CHANGELOG_POINTS\n\n$(cat CHANGELOG.old.md)" > CHANGELOG.md
+                  rm CHANGELOG.old.md
+
+            - name: Update lockfile
+              run: pnpm i
+
+            - name: Commit bump
+              if: steps.bump-type.outputs.bump-type != 'null'
+              uses: EndBug/add-and-commit@v7
+              with:
+                  branch: ${{ github.event.pull_request.base.ref }}
+                  message: "chore: Bump version to ${{ steps.versions.outputs.new-version }}"
+                  github_token: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN }}