refactor: Revamp CI workflows (#5661)

This change refactors the CI workflows to leverage the new CI Docker images for Debian, Red Hat, and Ubuntu.

.github/workflows/on-pr.yml

@@ -0,0 +1,133 @@
+# This workflow runs all workflows to check, build and test the project on
+# various Linux flavors, as well as on MacOS and Windows, on every push to a
+# user branch. However, it will not run if the pull request is a draft unless it
+# has the 'DraftRunCI' label.
+name: PR
+
+on:
+  pull_request:
+    paths:
+      - '.github/actions/build-deps/**'
+      - '.github/actions/build-test/**'
+      - '.github/scripts/levelization/**'
+      - '.github/scripts/strategy-matrix/**'
+      - '.github/workflows/build-test.yml'
+      - '.github/workflows/check-format.yml'
+      - '.github/workflows/check-levelization.yml'
+      - '.github/workflows/notify-clio.yml'
+      - '.github/workflows/on-pr.yml'
+      # Keep the list of paths below in sync with those in the `on-trigger.yml`
+      # file.
+      - 'cmake/**'
+      - 'conan/**'
+      - 'external/**'
+      - 'include/**'
+      - 'src/**'
+      - 'tests/**'
+      - '.clang-format'
+      - '.codecov.yml'
+      - '.pre-commit-config.yaml'
+      - 'CMakeLists.txt'
+      - 'conanfile.py'
+    types:
+      - opened
+      - synchronize
+      - labeled
+      - unlabeled
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  CONAN_REMOTE_NAME: xrplf
+  CONAN_REMOTE_URL: https://conan.ripplex.io
+
+jobs:
+  # This job determines whether the workflow should run. It runs when:
+  # * Opened as a non-draft PR.
+  # * A commit is added to a non-draft PR or the PR has the 'DraftRunCI' label.
+  # * A draft PR has the 'DraftRunCI' label added.
+  # * A non-draft PR has the 'DraftRunCI' label removed.
+  # These checks are in part to ensure the workflow won't run needlessly while
+  # also allowing it to be triggered without having to add a no-op commit. A new
+  # workflow execution can be triggered by adding and then removing the label on
+  # a non-draft PR, or conversely by removing it and then adding it back on a
+  # draft PR; this can be useful in certain cases.
+  should-run:
+    if: >-
+      ${{
+        (github.event.action == 'opened' && !github.event.pull_request.draft) ||
+        (github.event.action == 'synchronize' && (!github.event.pull_request.draft || contains(github.event.pull_request.labels.*.name, 'DraftRunCI'))) ||
+        (github.event.action == 'labeled' && github.event.pull_request.draft && github.event.label.name == 'DraftRunCI') ||
+        (github.event.action == 'unlabeled' && !github.event.pull_request.draft && github.event.label.name == 'DraftRunCI')
+      }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: No-op
+        run: echo ''
+
+  check-clang-format:
+    needs: should-run
+    uses: ./.github/workflows/check-format.yml
+
+  check-levelization:
+    needs: should-run
+    uses: ./.github/workflows/check-levelization.yml
+
+  # This job works around the limitation that GitHub Actions does not support
+  # using environment variables as inputs for reusable workflows.
+  generate-outputs:
+    needs: should-run
+    runs-on: ubuntu-latest
+    steps:
+      - name: No-op
+        run: echo ''
+    outputs:
+      conan_remote_name: ${{ env.CONAN_REMOTE_NAME }}
+      conan_remote_url: ${{ env.CONAN_REMOTE_URL }}
+
+  build-linux:
+    needs: generate-outputs
+    uses: ./.github/workflows/build-test.yml
+    with:
+      conan_remote_name: ${{ needs.generate-outputs.outputs.conan_remote_name }}
+      conan_remote_url: ${{ needs.generate-outputs.outputs.conan_remote_url }}
+      os: 'linux'
+    secrets:
+      codecov_token: ${{ secrets.CODECOV_TOKEN }}
+
+  build-macos:
+    needs: generate-outputs
+    uses: ./.github/workflows/build-test.yml
+    with:
+      conan_remote_name: ${{ needs.generate-outputs.outputs.conan_remote_name }}
+      conan_remote_url: ${{ needs.generate-outputs.outputs.conan_remote_url }}
+      os: 'macos'
+
+  build-windows:
+    needs: generate-outputs
+    uses: ./.github/workflows/build-test.yml
+    with:
+      conan_remote_name: ${{ needs.generate-outputs.outputs.conan_remote_name }}
+      conan_remote_url: ${{ needs.generate-outputs.outputs.conan_remote_url }}
+      os: 'windows'
+
+  notify-clio:
+    needs:
+      - generate-outputs
+      - build-linux
+      - build-macos
+      - build-windows
+    uses: ./.github/workflows/notify-clio.yml
+    with:
+      conan_remote_name: ${{ needs.generate-outputs.outputs.conan_remote_name }}
+      conan_remote_url: ${{ needs.generate-outputs.outputs.conan_remote_url }}
+    secrets:
+      clio_notify_token: ${{ secrets.CLIO_NOTIFY_TOKEN }}
+      conan_remote_username: ${{ secrets.CONAN_REMOTE_USERNAME }}
+      conan_remote_password: ${{ secrets.CONAN_REMOTE_PASSWORD }}