Set up the Swift version the extractor declares (#1422)

Co-authored-by: Aditya Sharad <6874315+adityasharad@users.noreply.github.com>

.github/workflows/__swift-custom-build.yml

@@ -33,6 +33,10 @@ jobs:
           version: cached
         - os: macos-latest
           version: cached
+        - os: ubuntu-latest
+          version: nightly-latest
+        - os: macos-latest
+          version: nightly-latest
     name: Swift analysis using a custom build command
     timeout-minutes: 45
     runs-on: ${{ matrix.os }}
@@ -44,15 +48,17 @@ jobs:
       uses: ./.github/prepare-test
       with:
         version: ${{ matrix.version }}
-    - uses: swift-actions/setup-swift@194625b58a582570f61cc707c3b558086c26b723
-    # Only macOS latest and nightly-latest support Swift 5.7.1
-      if: runner.os == 'Linux' || matrix.version == 'cached'
-      with:
-        swift-version: 5.7.0
     - uses: ./../action/init
+      id: init
       with:
         languages: swift
         tools: ${{ steps.prepare-test.outputs.tools-url }}
+    - uses: ./../action/.github/setup-swift
+      with:
+        codeql-path: ${{steps.init.outputs.codeql-path}}
+    - name: Check working directory
+      shell: bash
+      run: pwd
     - name: Build code
       shell: bash
       run: ./build.sh
@@ -67,6 +73,6 @@ jobs:
           exit 1
         fi
     env:
-      CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: 'true'
+      CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: 'true' # Remove when Swift is GA.
       DOTNET_GENERATE_ASPNET_CERTIFICATE: 'false'
       CODEQL_ACTION_TEST_MODE: true