ci: add automated release, dependabot and github codeowners

Author: oknozor

.github/CODEOWNERS

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+* @oknozor

.github/dependabot.yaml

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+version: 2
+updates:
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: daily
+      time: "14:05"
+    open-pull-requests-limit: 10

.github/workflows/Release.yml

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+name: Release
+
+on:
+  workflow_dispatch:
+    branches: main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    name: Perform release
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+          fetch-depth: 0
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+
+      - name: Add gpg test key pair
+        run: |
+          gpg --import tests/gpg/public.gpg
+          gpg --import tests/gpg/private.gpg
+          echo -e "5\ny\n" | gpg --no-tty --command-fd 0 --expert --edit-key [email protected] trust
+
+      # version publish steps are managed by cocogitto, see `cog.toml`
+      # and https://github.com/oknozor/cocogitto-action for more info
+      - name: Semver release
+        id: release
+        uses: oknozor/[email protected]
+        with:
+          release: true
+          check-latest-tag-only: true
+
+      - name: Generate Changelog
+        run: cog changelog --at ${{ steps.release.outputs.version }} -t full_hash > GITHUB_CHANGELOG.md
+
+      - name: Upload github release
+        uses: softprops/action-gh-release@v1
+        with:
+          body_path: GITHUB_CHANGELOG.md
+          tag_name: ${{ steps.release.outputs.version }}