CI macOS: swap version and arch position

was UltraGrid-<arch>-<version>.dmg (eg. UltraGrid-arm64-1.9.2.dmg),
which is not consistent with other platforms,
eg. UltraGrid-1.9.2-x86_64.AppImage and UltraGrid-1.9.2-win64.zip. The
one with the version just after UltraGrid seems to be more natural.

.github/scripts/environment.sh

@@ -20,7 +20,7 @@ fi
 
 # include platform on mac in version string
 if [ "$(uname -s)" = Darwin ]; then
-        VERSION="$(uname -m)-$VERSION"
+        VERSION="$VERSION-$(uname -m)"
 fi
 
 if [ -z "${CHANNEL-}" ]; then

data/MacOS-bundle-template/Contents/MacOS/update.sh

@@ -55,7 +55,7 @@ EOF
 if [ "$version" = master ]; then
         macos_ver_major=$(uname -r | cut -f 1 -d .)
         if [ "$macos_ver_major" -ge 21 ]; then
-                n=UltraGrid-$(uname -m)-continuous.dmg
+                n=UltraGrid-continuous-$(uname -m).dmg
         else
                 n=UltraGrid-nightly-alt.dmg
         fi