add RID for Alpine 3.15

Author: ayakael

pkg/Microsoft.NETCore.Platforms/runtime.compatibility.json

@@ -224,6 +224,57 @@
     "any",
     "base"
   ],
+  "alpine.3.15": [
+    "alpine.3.15",
+    "alpine.3.14",
+    "alpine.3.13",
+    "alpine.3.12",
+    "alpine.3.11",
+    "alpine.3.10",
+    "alpine.3.9",
+    "alpine.3.8",
+    "alpine.3.7",
+    "alpine.3.6",
+    "alpine",
+    "linux-musl",
+    "linux",
+    "unix",
+    "any",
+    "base"
+  ],
+  "alpine.3.15-x64": [
+    "alpine.3.15-x64",
+    "alpine.3.15",
+    "alpine.3.14-x64",
+    "alpine.3.14",
+    "alpine.3.13-x64",
+    "alpine.3.13",
+    "alpine.3.12-x64",
+    "alpine.3.12",
+    "alpine.3.11-x64",
+    "alpine.3.11",
+    "alpine.3.10-x64",
+    "alpine.3.10",
+    "alpine.3.9-x64",
+    "alpine.3.9",
+    "alpine.3.8-x64",
+    "alpine.3.8",
+    "alpine.3.7-x64",
+    "alpine.3.7",
+    "alpine.3.6-x64",
+    "alpine.3.6",
+    "alpine-x64",
+    "alpine",
+    "linux-musl-x64",
+    "linux-musl",
+    "linux-x64",
+    "linux",
+    "unix-x64",
+    "unix",
+    "any",
+    "base"
+  ],
+
   "alpine.3.6": [
     "alpine.3.6",
     "alpine",

pkg/Microsoft.NETCore.Platforms/runtime.json

@@ -66,6 +66,17 @@
         "alpine.3.13-x64"
       ]
     },
+    "alpine.3.15": {
+      "#import": [
+        "alpine.3.14"
+      ]
+    },
+    "alpine.3.15-x64": {
+      "#import": [
+        "alpine.3.15",
+        "alpine.3.14-x64"
+      ]
+    },
     "alpine.3.6": {
       "#import": [
         "alpine"

pkg/Microsoft.NETCore.Platforms/runtimeGroups.props

@@ -16,7 +16,7 @@
     <RuntimeGroup Include="alpine">
       <Parent>linux-musl</Parent>
       <Architectures>x64</Architectures>
-      <Versions>3.6;3.7;3.8;3.9;3.10;3.11;3.12;3.13;3.14</Versions>
+      <Versions>3.6;3.7;3.8;3.9;3.10;3.11;3.12;3.13;3.14;3.15</Versions>
     </RuntimeGroup>
 
     <RuntimeGroup Include="android">