Modernize packaging-related things in Red (#5924)

.github/workflows/run_pip_compile.yaml

@@ -0,0 +1,84 @@
+name: Generate requirements files with pip-compile.
+
+on:
+  workflow_dispatch:
+
+jobs:
+  generate_requirements:
+    name: Generate requirements files for ${{ matrix.os }} platform.
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+    steps:
+      - name: Checkout the repository.
+        uses: actions/checkout@v3
+
+      - name: Set up Python 3.8.
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install -U pip
+          python -m pip install -U pip-tools
+
+      - name: Generate requirements files.
+        id: compile_requirements
+        run: |
+          python .github/workflows/scripts/compile_requirements.py
+
+      - name: Upload requirements files.
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ steps.compile_requirements.outputs.sys_platform }}
+          path: requirements/${{ steps.compile_requirements.outputs.sys_platform }}-*.txt
+
+  merge_requirements:
+    name: Merge requirements files.
+    needs: generate_requirements
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository.
+        uses: actions/checkout@v3
+
+      - name: Set up Python 3.8.
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.8'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install -U "packaging>=22.0"
+
+      - name: Download Windows requirements.
+        uses: actions/download-artifact@v3
+        with:
+          name: win32
+          path: requirements
+      - name: Download Linux requirements.
+        uses: actions/download-artifact@v3
+        with:
+          name: linux
+          path: requirements
+      - name: Download macOS requirements.
+        uses: actions/download-artifact@v3
+        with:
+          name: darwin
+          path: requirements
+
+      - name: Merge requirements files.
+        run: |
+          python .github/workflows/scripts/merge_requirements.py
+
+      - name: Upload merged requirements files.
+        uses: actions/upload-artifact@v3
+        with:
+          name: merged
+          path: |
+            requirements/base.txt
+            requirements/extra-*.txt