Revert "Use the built-in swiftly on macOS builders"

This reverts commit 8abccba.

Author: cmcgee1024

.github/workflows/build_release.yml

@@ -51,10 +51,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      - name: Activate Swiftly
-        run: source /opt/swiftly/env.sh
+      - name: Prepare the action
+        run: ./scripts/prep-gh-action.sh --install-swiftly
       - name: Build Release Artifact
-        run: swiftly run swift run build-swiftly-release ${{ inputs.skip }} ${{ inputs.version }}
+        run: swift run build-swiftly-release ${{ inputs.skip }} ${{ inputs.version }}
       - name: Upload Release Artifact
         uses: actions/upload-artifact@v4
         with:

.github/workflows/nightly_snapshot_check.yml

@@ -33,9 +33,7 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      - name: Activate Swiftly
-        run: source /opt/swiftly/env.sh
-      - name: Install Main Snapshot
-        run: swiftly install main-snapshot
+      - name: Prepare the action
+        run: ./scripts/prep-gh-action.sh --install-swiftly --swift-main-snapshot
       - name: Build and Test
-        run: swiftly run +main-snapshot swift test
+        run: swift test

.github/workflows/pull_request.yml

@@ -30,10 +30,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      - name: Activate Swiftly
-        run: source /opt/swiftly/env.sh
+      - name: Prepare the action
+        run: ./scripts/prep-gh-action.sh --install-swiftly
       - name: Build and Test
-        run: swiftly run swift test
+        run: swift test
         timeout-minutes: 60
 
   tests-selfhosted:
@@ -88,10 +88,10 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-      - name: Activate Swiftly
-        run: source /opt/swiftly/env.sh
+      - name: Prepare the action
+        run: ./scripts/prep-gh-action.sh --install-swiftly
       - name: Build Artifact
-        run: swiftly run swift run build-swiftly-release --test --skip "999.0.0"
+        run: swift run build-swiftly-release --test --skip "999.0.0"
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with: