Reinstate Kong Alpine 2.8.5 as the main version

There was some confusion during the release of kong 2.8.5.
While on the 3.x series we no longer maintain Alpine, it is still
maintained in 2.x

As such, this PR reinstates Alpine as the head for 2.8.x.

The change in the Ubuntu SHA is due to the fact that we had to add a new
commit to the branch in order to rebuild alpine. The ubuntu files are
otherwise unchanged

library/kong

@@ -25,8 +25,16 @@ GitFetch: refs/tags/3.4.2
 Directory: ubuntu
 Architectures: amd64, arm64v8
 
-Tags: 2.8.5-ubuntu, 2.8-ubuntu, 2.8.5, 2.8, 2
-GitCommit: 3fe94ba928bf75b385bd98aa2d5ad07b86fd3eb8
+Tags: 2.8.5-alpine, 2.8-alpine, 2.8.5, 2.8, 2
+GitCommit: cdf93ae2106f998a2245a3eee6814b1ae68781af
+GitFetch: refs/tags/2.8.5
+Directory: alpine
+Architectures: amd64
+
+Tags: 2.8.5-ubuntu, 2.8-ubuntu
+GitCommit: cdf93ae2106f998a2245a3eee6814b1ae68781af
 GitFetch: refs/tags/2.8.5
 Directory: ubuntu
 Architectures: amd64
+
+