Update appveyor.yml

appveyor.yml

@@ -21,9 +21,13 @@ environment:
     MSYS_BITNESS: 32
 
 install:
+# install new signing keyring
+- c:\msys64\usr\bin\bash -lc "curl -O http://repo.msys2.org/msys/x86_64/msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz"
+- c:\msys64\usr\bin\bash -lc "curl -O http://repo.msys2.org/msys/x86_64/msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz.sig"
+- c:\msys64\usr\bin\bash -lc "pacman-key --verify msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz.sig"
+- c:\msys64\usr\bin\bash -lc "pacman -U msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz"
+# remove packages which can break build
 - c:\msys64\usr\bin\bash -lc "pacman --noconfirm -Rns gcc-fortran gcc mingw-w64-{i686,x86_64}-gcc-ada mingw-w64-{i686,x86_64}-gcc-objc"
-# TODO: revert that change when appveyor's images will be updated
-#- c:\msys64\usr\bin\bash -l "build/appveyor-msys2-upgrade.bash"
 # update runtime
 - c:\msys64\usr\bin\bash -lc "pacman --noconfirm -Syuu"
 # update packages and install required