Add .Net 6.0 latest version (#5912)

images/macos/provision/core/dotnet.sh

@@ -22,11 +22,18 @@ DOTNET_VERSIONS=($(get_toolset_value '.dotnet.versions | .[]'))
 
 for DOTNET_VERSION in "${DOTNET_VERSIONS[@]}"; do
     RELEASE_URL="https://raw.githubusercontent.com/dotnet/core/master/release-notes/${DOTNET_VERSION}/releases.json"
-    ARGS_LIST+=(
+
-        $(curl -s "$RELEASE_URL" | \
+    if [[ $DOTNET_VERSION == "6.0" ]]; then
-        jq -r '.releases[].sdk."version"' | grep -v -E '\-(preview|rc)\d*' | \
+        ARGS_LIST+=(
-        sort -r | rev | uniq -s 2 | rev)
+            $(curl -s "$RELEASE_URL" | jq -r 'first(.releases[].sdks[]?.version | select(contains("preview") or contains("rc") | not))')
-    )
+        )
+    else
+        ARGS_LIST+=(
+            $(curl -s "$RELEASE_URL" | \
+            jq -r '.releases[].sdk."version"' | grep -v -E '\-(preview|rc)\d*' | \
+            sort -r | rev | uniq -s 2 | rev)
+        )
+    fi
 done
 
 for ARGS in "${ARGS_LIST[@]}"; do

images/macos/toolsets/toolset-11.json

@@ -306,7 +306,8 @@
     "dotnet": {
         "versions": [
             "3.1",
-            "5.0"
+            "5.0",
+            "6.0"
         ]
     },
     "ruby": {

images/macos/toolsets/toolset-12.json

@@ -236,7 +236,8 @@
     "dotnet": {
         "versions": [
             "3.1",
-            "5.0"
+            "5.0",
+            "6.0"
         ]
     },
     "ruby": {