Add Debian variants of Oracle-consuming versions

[tianon]

These are images based on the official JDK artifacts for 12+ released on https://jdk.java.net/ with a Debian base in addition to Oracle.

Closes #302

A Useful Diff:

$ diff -u <(bashbrew cat openjdk) <(bashbrew cat <(./generate-stackbrew-library.sh))
--- /dev/fd/63	2019-09-06 12:13:35.609665720 -0700
+++ /dev/fd/62	2019-09-06 12:13:35.609665720 -0700
@@ -7,6 +7,14 @@
 Directory: 14/jdk/oracle
 Constraints: !aufs
 
+Tags: 14-ea-13-jdk-buster, 14-ea-13-buster, 14-ea-jdk-buster, 14-ea-buster, 14-jdk-buster, 14-buster
+GitCommit: b26a21dd82ee269efe26a9407eff9235bdde3dad
+Directory: 14/jdk
+
+Tags: 14-ea-13-jdk-slim-buster, 14-ea-13-slim-buster, 14-ea-jdk-slim-buster, 14-ea-slim-buster, 14-jdk-slim-buster, 14-slim-buster, 14-ea-13-jdk-slim, 14-ea-13-slim, 14-ea-jdk-slim, 14-ea-slim, 14-jdk-slim, 14-slim
+GitCommit: b26a21dd82ee269efe26a9407eff9235bdde3dad
+Directory: 14/jdk/slim
+
 Tags: 14-ea-12-jdk-alpine3.10, 14-ea-12-alpine3.10, 14-ea-jdk-alpine3.10, 14-ea-alpine3.10, 14-jdk-alpine3.10, 14-alpine3.10, 14-ea-12-jdk-alpine, 14-ea-12-alpine, 14-ea-jdk-alpine, 14-ea-alpine, 14-jdk-alpine, 14-alpine
 GitCommit: b57ab1457d190f313c46ffbec2b994b041b4d08c
 Directory: 14/jdk/alpine
@@ -38,6 +46,14 @@
 Directory: 13/jdk/oracle
 Constraints: !aufs
 
+Tags: 13-jdk-buster, 13-buster
+GitCommit: b26a21dd82ee269efe26a9407eff9235bdde3dad
+Directory: 13/jdk
+
+Tags: 13-jdk-slim-buster, 13-slim-buster, 13-jdk-slim, 13-slim
+GitCommit: b26a21dd82ee269efe26a9407eff9235bdde3dad
+Directory: 13/jdk/slim
+
 Tags: 13-jdk-windowsservercore-1809, 13-windowsservercore-1809
 SharedTags: 13-jdk-windowsservercore, 13-windowsservercore, 13-jdk, 13
 Architectures: windows-amd64
@@ -65,6 +81,14 @@
 Directory: 12/jdk/oracle
 Constraints: !aufs
 
+Tags: 12.0.2-jdk-buster, 12.0.2-buster, 12.0-jdk-buster, 12.0-buster, 12-jdk-buster, 12-buster, jdk-buster, buster
+GitCommit: b26a21dd82ee269efe26a9407eff9235bdde3dad
+Directory: 12/jdk
+
+Tags: 12.0.2-jdk-slim-buster, 12.0.2-slim-buster, 12.0-jdk-slim-buster, 12.0-slim-buster, 12-jdk-slim-buster, 12-slim-buster, jdk-slim-buster, slim-buster, 12.0.2-jdk-slim, 12.0.2-slim, 12.0-jdk-slim, 12.0-slim, 12-jdk-slim, 12-slim, jdk-slim, slim
+GitCommit: b26a21dd82ee269efe26a9407eff9235bdde3dad
+Directory: 12/jdk/slim
+
 Tags: 12.0.2-jdk-windowsservercore-1809, 12.0.2-windowsservercore-1809, 12.0-jdk-windowsservercore-1809, 12.0-windowsservercore-1809, 12-jdk-windowsservercore-1809, 12-windowsservercore-1809, jdk-windowsservercore-1809, windowsservercore-1809
 SharedTags: 12.0.2-jdk-windowsservercore, 12.0.2-windowsservercore, 12.0-jdk-windowsservercore, 12.0-windowsservercore, 12-jdk-windowsservercore, 12-windowsservercore, jdk-windowsservercore, windowsservercore, 12.0.2-jdk, 12.0.2, 12.0-jdk, 12.0, 12-jdk, 12, jdk, latest
 Architectures: windows-amd64

[tianon]

To my point in #302 (comment):

I do want to be very clear that if we reintroduce Debian variants for 12+ they will not match the existing Debian variants, which is a big point to hesitate on here IMO.

I think we're reasonably safe to reintroduce these given the amount of time that has now passed since the old versions were deprecated (including a major Debian release, so these are Buster-based instead of Stretch-based).

[yosifkit]

Should we add something like docker-library/php#542?

[tianon]

Oh, very interesting thought, although I think that's slightly orthogonal (given that we already have the Adopt variants for 8 and 11 which do not include something like that but could probably also benefit).

I think it's a little bit harder to achieve though given the varying nature of JRE/JDK package names (things like default-jre are a common dependency ☹️).

[tianon]

Rebased/updated 👍

[tianon]

... and now the relevant half of the CI is green 😄