Take advantage of Chainguard maintained versions of various actions. (#609)

* Take advantage of Chainguard maintained versions of various actions.

* Bump cosign version

.github/workflows/boilerplate.yaml

@@ -24,47 +24,9 @@ jobs:
           language: Bash
 
     steps:
-      - uses: actions/setup-go@v2
-        with:
-          go-version: 1.17.x
-
       - uses: actions/checkout@v2
 
-      - name: Install Tools
-        run: |
-          TEMP_PATH="$(mktemp -d)"
-          cd $TEMP_PATH
-
-          echo '::group::🐶 Installing reviewdog ... https://github.com/reviewdog/reviewdog'
-          curl -sfL https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b "${TEMP_PATH}" 2>&1
-          echo '::endgroup::'
-
-          echo '::group:: Installing boilerplate-check ... https://github.com/mattmoor/boilerplate-check'
-          go get github.com/mattmoor/boilerplate-check/cmd/boilerplate-check
-          echo '::endgroup::'
-
-          echo "${TEMP_PATH}" >> $GITHUB_PATH
-
-      - name: ${{ matrix.language }} license boilerplate
-        shell: bash
-        env:
-          REVIEWDOG_GITHUB_API_TOKEN: ${{ github.token }}
-        run: |
-          set -e
-          cd "${GITHUB_WORKSPACE}" || exit 1
-
-          echo '::group:: Running github.com/mattmoor/boilerplate-check for ${{ matrix.language }} with reviewdog 🐶 ...'
-          # Don't fail because of boilerplate-check
-          set +o pipefail
-          boilerplate-check check \
-            --boilerplate ./hack/boilerplate/boilerplate.${{ matrix.extension }}.txt \
-            --file-extension ${{ matrix.extension }} \
-            --exclude "(vendor|third_party)/" |
-          reviewdog -efm="%A%f:%l: %m" \
-                -efm="%C%.%#" \
-                -name="${{ matrix.language }} headers" \
-                -reporter="github-pr-check" \
-                -filter-mode="diff_context" \
-                -fail-on-error="true" \
-                -level="error"
-          echo '::endgroup::'
+      - uses: chainguard-dev/actions/boilerplate@84c993eaf02da1c325854fb272a4df9184bd80fc # main
+        with:
+          extension: ${{ matrix.extension }}
+          language: ${{ matrix.language }}