update CI to macOS 15

Author: tayloraswift

.github/workflows/docs.yml

@@ -39,18 +39,12 @@ jobs:
                     --package-name swift-unidoc
 
     macos:
-        runs-on: macos-14
+        runs-on: macos-15
         name: macOS
         env:
             UNIDOC_ENABLE_INDEXSTORE: "0"
 
         steps:
-            -   name: Install Swift 6.0
-                uses: tayloraswift/swift-install-action@master
-                with:
-                    swift-prefix: "swift-6.0-release/xcode/swift-6.0-RELEASE"
-                    swift-id: "swift-6.0-RELEASE"
-
             -   name: Install Unidoc
                 uses: tayloraswift/swift-unidoc-action@master
 

.github/workflows/package.yml

@@ -9,15 +9,9 @@ on:
 
 jobs:
     macos:
-        runs-on: macos-14
+        runs-on: macos-15
         name: macOS
         steps:
-            -   name: Install Swift 6.0
-                uses: tayloraswift/swift-install-action@master
-                with:
-                    swift-prefix: "swift-6.0-release/xcode/swift-6.0-RELEASE"
-                    swift-id: "swift-6.0-RELEASE"
-
             -   name: Checkout repository
                 uses: actions/checkout@v3
 

.github/workflows/test.yml

@@ -37,18 +37,12 @@ jobs:
                         /bin/bash .github/pipeline
 
     macos:
-        runs-on: macos-14
+        runs-on: macos-15
         name: macOS
         env:
             UNIDOC_ENABLE_INDEXSTORE: "1"
 
         steps:
-            -   name: Install Swift 6.0
-                uses: tayloraswift/swift-install-action@master
-                with:
-                    swift-prefix: "swift-6.0-release/xcode/swift-6.0-RELEASE"
-                    swift-id: "swift-6.0-RELEASE"
-
             -   name: Checkout repository
                 uses: actions/checkout@v3
 

.gitignore

@@ -5,6 +5,7 @@
 .testing
 .unidoc
 .vscode
+.DS_Store
 
 unidoc/
 swiftpm/