Migrate remaining files from the old version of the repo

- Migrate `CHANGELOG.md`, `.VERSION`, `LICENSE`, GitHub pipelines, release script, GitHub issue templates.
- Add in Makefile the commands to prepare release and make the release tag.

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Build and Test
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+    - name: Set up Go 1.x
+      uses: actions/setup-go@v2
+      with:
+        go-version: ^1.18
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v2
+
+    - name: Build
+      run: go build -v ./...
+
+    - name: Test
+      run: make test

.github/workflows/release-pr.yml

@@ -0,0 +1,85 @@
+on:
+  create:
+    branches:
+
+name: Open Release PR for review
+
+jobs:
+  # This job is necessary because GitHub does not (yet) support
+  # filtering `create` triggers by branch name.
+  # See: https://github.community/t/trigger-job-on-branch-created/16878/5
+  should_create_pr:
+    name: Check if PR for branch already exists
+    runs-on: ubuntu-latest
+    outputs:
+      result: ${{ steps.is_release_branch_without_pr.outputs.result }}
+    steps:
+      - id: is_release_branch_without_pr
+        name: Find matching PR
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            // Search for an existing PR with head & base
+            //  that match the created branch
+
+            const [releaseBranchName] = context.ref.match("release/v[0-9]+\.[0-9]+\.[0-9]+") || []
+
+            if(!releaseBranchName) { return false }
+
+            const {data: prs} = await github.pulls.list({
+                ...context.repo,
+                state: 'open',
+                head: `1Password:${releaseBranchName}`,
+                base: context.payload.master_branch
+            })
+
+            return prs.length === 0
+
+  create_pr:
+    needs: should_create_pr
+    if: needs.should_create_pr.outputs.result == 'true'
+    name: Create Release Pull Request
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Parse release version
+        id: get_version
+        run: echo "::set-output name=version::$(echo $GITHUB_REF | sed 's|^refs/heads/release/v?*||g')"
+
+      - name: Prepare Pull Request
+        id: prep_pr
+        run: |
+          CHANGELOG_PATH=$(printf "%s/CHANGELOG.md" "${GITHUB_WORKSPACE}")
+
+          LOG_ENTRY=$(awk '/START\/v[0-9]+\.[0-9]+\.[0-9]+*/{f=1; next} /---/{if (f == 1) exit} f' "${CHANGELOG_PATH}")
+          export PR_BODY=$(cat <<EOF
+          This is an automated PR for a new release.
+
+          Please check the following before approving:
+          - [ ] Changelog is accurate. The documented changes for this release are printed below.
+          - [ ] Any files referencing a version number. Confirm it matches the version number in the branch name.
+          ---
+          ## Release Changelog Preview
+          ${LOG_ENTRY}
+          EOF
+          )
+
+          # Sanitizes multiline strings for action outputs (https://medium.com/agorapulse-stories/23f56447d209)
+          PR_BODY="${PR_BODY//'%'/'%25'}"
+          PR_BODY="${PR_BODY//$'\n'/'%0A'}"
+          PR_BODY="${PR_BODY//$'\r'/'%0D'}"
+          echo "::set-output name=pr_body::$(echo "$PR_BODY")"
+
+      - name: Create Pull Request via API
+        id: post_pr
+        uses: octokit/request-action@v2.x
+        with:
+          route: POST /repos/${{ github.repository }}/pulls
+          title: ${{ format('Prepare Release - v{0}', steps.get_version.outputs.version) }}
+          head: ${{ github.ref }}
+          base: ${{ github.event.master_branch }}
+          body: ${{ toJson(steps.prep_pr.outputs.pr_body) }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yml

@@ -0,0 +1,57 @@
+name: release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release-docker:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_CLI_EXPERIMENTAL: "enabled"
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      -
+        name: Docker meta
+        id: meta
+        uses: crazy-max/ghaction-docker-meta@v2
+        with:
+          images: |
+            1password/onepassword-operator
+          # Publish image for x.y.z and x.y
+          # The latest tag is automatically added for semver tags
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+      - name: Get the version from tag
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF#refs/tags/v}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Docker Login
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            operator_version=${{ steps.get_version.outputs.VERSION }}