[chore] add labels to pr (#1475)

* add label to PR

Signed-off-by: Pierre Tessier <pierre@pierretessier.com>

* Update label-pr.yml

* Update label-pr.yml

* Delete .github/workflows/label-pr.yml

* add labels to PRs

Signed-off-by: Pierre Tessier <pierre@pierretessier.com>

* Update docker-compose.yaml to docker-compose*.yml

---------

Signed-off-by: Pierre Tessier <pierre@pierretessier.com>
Co-authored-by: Juliano Costa <julianocosta89@outlook.com>
Co-authored-by: Juliano Costa <juliano.costa@datadoghq.com>

Author: puckpuck

.github/workflows/label-pr.yml

@@ -0,0 +1,59 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+# adds a label to a pull request if certain files are changed
+name: Label Pull Requests
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Check for changed files
+        id: file_changes
+        uses: dorny/paths-filter@v2
+        with:
+          list-files: shell
+          filters: |
+            docsUpdateRequired:
+              - 'src/flagd/**'
+            helmUpdateRequired:
+              - '.env'
+              - 'docker-compose*.yml'
+              - 'src/flagd/**'
+              - 'src/grafana/**'
+              - 'src/otelcollector/**'
+              - 'src/prometheus/**'
+
+      - name: "Add Label: docs-update-required"
+        if: steps.file_changes.outputs.docsUpdateRequired == 'true'
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            const issue_number = context.issue.number;
+            github.issues.addLabels({
+              issue_number: issue_number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ['docs-update-required']
+            })
+
+      - name: "Add Label: helm-update-required"
+        if: steps.file_changes.outputs.helmUpdateRequired == 'true'
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            const issue_number = context.issue.number;
+            github.issues.addLabels({
+              issue_number: issue_number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ['helm-update-required']
+            })