[ATL-1386] Add simple rules

.github/CODEOWNERS

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+# Apollo maintainers (Jesus Diaz Vico, Shota Jolbordi):
+/apollo/ @jesusdiazvico @shotexa
+
+# Castor maintainers (Ilya Peresadin, Fabio Pinheiro):
+/castor/ @pva701 @FabioPinheiro
+
+# Mercury maintainers (Fabio Pinheiro, Shailesh Patil):
+/mercury/ @FabioPinheiro @mineme0110
+
+# Pluto maintainers (Ilya Peresadin, Yurii Shynbuiev):
+/pluto/ @pva701 @yshyn-iohk
+
+# Pollux maintainers (Shota Jolbordi, Yurii Shynbuiev):
+/pollux/ @shotexa @yshyn-iohk
+
+# Github maintainer (Anton Baliasnikov):
+/.github/ @antonbaliasnikov
+
+# Everything else will be reviewed by someone from the Atala group
+* @input-output-hk/atala

.github/PULL_REQUEST_TEMPLATE.md

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+## Overview
+<!-- What this PR does, and why is needed, a useful description is expected, and relevant tickets should be mentioned -->
+Fixes ATL-xxxx
+
+## Added features
+<!-- Short list of new features/fixes added -->
+- [ ]
+## Checklist
+<!-- Details you need to consider that are commonly forgotten -->
+<!-- Pre-submit checklist should be marked as completed when PR moves out from DRAFT -->
+- [ ] Self-reviewed the diff
+- [ ] New code has inline documentation
+- [ ] New code has proper comments/tests
+- [ ] Any changes not covered by tests have been tested manually

.github/labeler.yml

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+repo:
+- '*'
+apollo:
+- apollo/**/*
+castor:
+- castor/**/*
+mercury:
+- mercury/**/*
+pluto:
+- pluto/**/*
+pollux:
+- pollux/**/*
+ci:
+- .github/**/*
+docs:
+- docs/**/*
+- README.md

.github/workflows/labeler.yml

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+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v3
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/lint.yml

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+name: Linter
+
+# Default shell is `sh`
+# which is old, use bourne-again version instead
+defaults:
+  run:
+    shell: bash
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    name: Lint changes
+    runs-on: ubuntu-latest
+    env:
+      APPLY_FIXES: all
+      APPLY_FIXES_EVENT: pull_request
+      APPLY_FIXES_MODE: commit
+      VALIDATE_ALL_CODEBASE: ${{ github.ref_name == 'main' }}
+      DISABLE: COPYPASTE,SPELL
+      GITHUB_TOKEN: ${{ secrets.ATALA_GITHUB_TOKEN }}
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.ATALA_GITHUB_TOKEN }}
+          fetch-depth: 0
+      - name: Mega-Linter
+        id: ml
+        uses: megalinter/megalinter@v5
+      - name: Prepare commit
+        if: |
+          (success() || failure()) &&
+          steps.ml.outputs.has_updated_sources == 1 &&
+          github.event_name == 'pull_request'
+        run: sudo chown -Rc ${UID} .git/
+      - name: Import GPG key
+        id: import_gpg
+        if: |
+          (success() || failure()) &&
+          steps.ml.outputs.has_updated_sources == 1 &&
+          github.event_name == 'pull_request'
+        uses: crazy-max/ghaction-import-gpg@v3
+        with:
+          gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
+          git-user-signingkey: true
+          git-commit-gpgsign: true
+      - name: Commit and push applied linter fixes
+        if: |
+          (success() || failure()) &&
+          steps.ml.outputs.has_updated_sources == 1 &&
+          github.event_name == 'pull_request'
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          branch: ${{ github.event.pull_request.head.ref }}
+          commit_message: "[Mega-Linter] Apply linters fixes"
+          commit_options: "--gpg-sign"
+          commit_user_name: ${{ steps.import_gpg.outputs.name }}
+          commit_user_email: ${{ steps.import_gpg.outputs.email }}
+      - name: Archive production artifacts
+        if: success() || failure()
+        uses: actions/upload-artifact@v2
+        with:
+          name: Mega-Linter reports
+          path: |
+            report
+            mega-linter.log

.github/workflows/pr-check.yml

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+name: Check PR
+
+env:
+  # Maximum number of lines allowed to be changed in one PR
+  MAX_CHANGED_LINES: 500
+  PR_TITLE_MAX_LENGTH: 70
+  # Title must be `[ATL-1234] ...`
+  PR_TITLE_REGEXP: '\[\w+-\d+\] .+'
+
+defaults:
+  run:
+    shell: bash
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+jobs:
+  check-pr-title:
+    name: "Check PR title"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: deepakputhraya/action-pr-title@master
+        name: Validate PR Title
+        with:
+          regex: ${{ env.PR_TITLE_REGEXP }}
+          max_length: ${{ env.PR_TITLE_MAX_LENGTH }}
+          github_token: ${{ secrets.ATALA_GITHUB_TOKEN }}
+      - uses: mshick/add-pr-comment@v1
+        name: Comment on PR
+        if: failure()
+        env:
+          GITHUB_TOKEN: ${{ secrets.ATALA_GITHUB_TOKEN }}
+        with:
+          message: |
+            Please fix the title of this PR.<br>
+            If you don't have ATL number, you must create it.<br>
+            Examples:
+              * `[ATL-1234] New feature description`
+              * `[ATL-1234] [HUGE] Huge new feature description (mind the space between ] and [)`
+  check-pr-size:
+    name: "Check PR size"
+    runs-on: ubuntu-latest
+    env:
+      TITLE: ${{ github.event.pull_request.title }}
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v2
+      - name: Get diff
+        uses: technote-space/get-diff-action@v5
+        with:
+          SET_ENV_NAME_LINES: LINES_CHANGED
+      - name: Check diff size
+        run: |
+          echo "This PR changes: ${LINES_CHANGED} lines"
+          if [[ "$TITLE" =~ "[HUGE]" ]]; then
+            echo "PR marked as [HUGE], skipping size check."
+            exit 0
+          fi
+          if (( LINES_CHANGED > MAX_CHANGED_LINES )); then
+            echo "ERROR: This PR changes more than ${MAX_CHANGED_LINES} lines."
+            echo "Please, separate this PR to small parts. Thanks!"
+            exit 1
+          fi

.mega-linter.yml

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+# Configuration file for Mega-Linter
+# See all available variables at https://megalinter.github.io/configuration/
+
+APPLY_FIXES: all
+DEFAULT_BRANCH: main
+DISABLE: [COPYPASTE, SPELL, CREDENTIALS]
+SHOW_ELAPSED_TIME: false
+FILEIO_REPORTER: false
+FLAVOR_SUGGESTIONS: false
+PRINT_ALPACA: false
+VALIDATE_ALL_CODEBASE: false
+SHOW_SKIPPED_LINTERS: false
+LOG_LEVEL: INFO
+# This pre-command fixes complex CLRF bug
+# when MegaLinter takes changes, it checkouts code twice
+# that could lead to new files in workspace created
+# with CLRF instead of CL due docker/python/git chain
+PRE_COMMANDS:
+  - command: git config --global core.autocrlf input
+    cwd: "workspace"