Attempt to speed up completion generation in CI

By only generating it once for unix and once for windows and passing it
through outputs.

.github/workflows/CICD.yml

@@ -54,9 +54,39 @@ jobs:
     - name: Run tests
       run: cargo test --locked
 
+  completions:
+    name: Generate shell completions
+    runs-on: ${{ matrix.job.os }}
+    strategy:
+      matrix:
+        # Completions are different depending on the OS
+        job:
+          - { name: unix,    os: ubuntu-20.04 }
+          - { name: windows, os: windows-2019 }
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v3
+
+      - name: Install rsut toolchain
+        run: |
+          rustup set profile minimal
+          rustup toolchain install stable
+          rustup default stable
+      - name: Generate completions
+        # Use dev profile so it builds faster
+        run: make completions PROFILE=dev
+      - id: upload
+        name: upload completions
+        uses: actions/upload-artifact@v3
+        with:
+          name: completions-${{ matrix.job.name }}
+          path: autocomplete
+          retention-days: 7
+
   build:
     name: ${{ matrix.job.os }} (${{ matrix.job.target }})
     runs-on: ${{ matrix.job.os }}
+    needs: completions
     strategy:
       fail-fast: false
       matrix:
@@ -179,10 +209,19 @@ jobs:
     - name: Run tests
       run: ${{ env.CARGO_CMD }} test --locked --target=${{ matrix.job.target }} ${{ steps.test-options.outputs.CARGO_TEST_OPTIONS}}
 
-    - name: Generate completions
-      id: completions
-      shell: bash
-      run: make completions
+    - name: Download Unix Completions
+      if: "!startsWith(matrix.job.os, 'windows')"
+      uses: actions/download-artifact@v3
+      with:
+        name: completions-unix
+        path: autocomplete/
+
+    - name: Download Windows Completions
+      if: "startsWith(matrix.job.os, 'windows')"
+      uses: actions/download-artifact@v3
+      with:
+        name: completions-windows
+        path: autocomplete/
 
     - name: Create tarball
       id: package