Support FROM...AS syntax for multi stage build dockerfiles
<string>Dockerfile</string>
<key>patterns</key>
<array>
+ <dict>
+ <key>captures</key>
+ <dict>
+ <key>1</key>
+ <dict>
+ <key>name</key>
+ <string>keyword.other.special-method.dockerfile</string>
+ </dict>
+ <key>2</key>
+ <dict>
+ <key>name</key>
+ <string>keyword.other.special-method.dockerfile</string>
+ </dict>
+ </dict>
+ <key>match</key>
+ <string>^\s*\b(FROM)\b.*?\b(AS)\b</string>
+ </dict>
<dict>
<key>captures</key>
<dict>
