CI: Cache improvements

.travis.yml

@@ -25,7 +25,20 @@ env:
     - DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
     - RUNTIMES="generic win-x64 linux-x64 linux-arm osx-x64" # https://github.com/travis-ci/travis-ci/issues/1444
 
-before_script: dotnet restore
+cache:
+  directories:
+  - $HOME/.local/share/NuGet
+  - $HOME/.nuget
+
+before_script:
+  - |
+    set -e
+
+    if git diff --name-only HEAD^ HEAD | grep -Fq '.csproj'; then
+        dotnet nuget locals -c all
+    fi
+
+    dotnet restore
 
 script:
   - |

appveyor.yml

@@ -31,7 +31,9 @@ install:
     Invoke-WebRequest -Uri 'https://raw.githubusercontent.com/dotnet/cli/master/scripts/obtain/dotnet-install.ps1' -OutFile '.\scripts\obtain\dotnet-install.ps1'
 
     .\scripts\obtain\dotnet-install.ps1 -Channel "$env:DOTNET_CHANNEL" -InstallDir "$env:DOTNET_INSTALL_DIR"
-cache: '%UserProfile%\.nuget\packages -> **\*.csproj'
+cache:
+- '%LocalAppData%\NuGet -> **\*.csproj'
+- '%UserProfile%\.nuget -> **\*.csproj'
 before_build:
 - ps: >-
     $ErrorActionPreference = 'Stop'