Adding release note generator action based on k8s release notes gener…

…ator tool

Signed-off-by: Scott Nichols <[email protected]>

.github/pull-request-template.md

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+Fixes #
+
+<!-- Please include the 'why' behind your changes if no issue exists -->
+
+## Proposed Changes
+
+-
+-
+-
+
+**Release Note**
+
+<!--
+If this change has user-visible impact, write a release note in the block
+below. If this change has no user-visible impact, no release note is needed.
+-->
+
+```release-note
+
+```

.github/workflows/release-notes.yaml

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+# Copyright 2021 The CloudEvents Authors.
+# Copyright 2020 The Knative Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: 'Release Notes'
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: 'Branch? (master)'
+        required: true
+        default: 'master'
+      start-sha:
+        description: 'Starting SHA? (last tag on branch)'
+      end-sha:
+        description: 'Ending SHA? (latest HEAD)'
+
+jobs:
+  release-notes:
+    name: Release Notes
+    runs-on: 'ubuntu-latest'
+
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+    steps:
+      - name: Set up Go
+        uses: actions/setup-go@v2
+
+      - name: Install Dependencies
+        run: GO111MODULE=on go get k8s.io/release/cmd/release-notes
+
+      - name: Check out code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      # Note: Defaults needs to run after we check out the repo.
+      - name: Defaults
+        run: |
+          echo ORG=$(echo '${{ github.repository }}' | awk -F '/' '{print $1}') >> $GITHUB_ENV
+          echo REPO=$(echo '${{ github.repository }}' | awk -F '/' '{print $2}') >> $GITHUB_ENV
+
+          echo "BRANCH=${{ github.event.inputs.branch }}" >> $GITHUB_ENV
+
+          if [[ "${{ github.event.inputs.start-sha }}" != "" ]]; then
+            echo "START_SHA=${{ github.event.inputs.start-sha }}" >> $GITHUB_ENV
+          else
+            # Default Starting SHA (thanks @dprotaso)
+            export semver=$(git describe --match "v[0-9]*" --abbrev=0)
+            echo "Using ${semver} tag for starting sha."
+            echo START_SHA=$(git rev-list -n 1 "${semver}") >> $GITHUB_ENV
+          fi
+
+          if [[ "${{ github.event.inputs.end-sha }}" != "" ]]; then
+            echo "END_SHA=${{ github.event.inputs.end-sha }}" >> $GITHUB_ENV
+          else
+            # Default Ending SHA (thanks @dprotaso)
+            echo "END_SHA=$(git rev-list -n 1 HEAD)" >> $GITHUB_ENV
+          fi
+
+      - name: Generate Notes
+        run: |
+          # See  https://github.com/kubernetes/release/tree/master/cmd/release-notes for options.
+          # Note: we are setting env vars in the Defaults step.
+          release-notes \
+            --required-author "" \
+            --repo-path       "$(pwd)" \
+            --output          release-notes.md
+
+      - name: Display Notes
+        run: |
+          cat release-notes.md
+
+      - name: Archive Release Notes
+        uses: actions/upload-artifact@v2
+        with:
+          name: release-notes.md
+          path: release-notes.md