Add slim variants

[tianon]

Closes #131

cc @bjornbak 👍

I think we should consider swapping the non-slim variants to not use -headless as well, but IMO that should happen as a separate discussion for this one (I only bring it up because having this is a precursor to being able to consider something like that, ala #130). 😄

[tianon]

Hahaha, whoops:

	'java-hello-world' [5/5]...Error response from daemon: manifest for openjdk:9-jdk-slim not found

(The openjdk:9-jdk-slim image isn't pushed yet, so can't be used for testing openjdk:9-jre-slim 😇)

[tianon]

$ for v in 6 7 8 9; do diff -u $v-jdk/Dockerfile $v-jdk/slim/Dockerfile; done
--- 6-jdk/Dockerfile	2017-07-21 12:27:42.366410292 -0700
+++ 6-jdk/slim/Dockerfile	2017-07-21 12:27:42.367410264 -0700
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM buildpack-deps:wheezy-scm
+FROM debian:wheezy-slim
 
 # A few reasons for installing distribution-provided OpenJDK:
 #
--- 7-jdk/Dockerfile	2017-07-21 12:27:42.367410264 -0700
+++ 7-jdk/slim/Dockerfile	2017-07-21 12:27:42.367410264 -0700
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM buildpack-deps:jessie-scm
+FROM debian:jessie-slim
 
 # A few reasons for installing distribution-provided OpenJDK:
 #
--- 8-jdk/Dockerfile	2017-07-21 12:27:42.368410235 -0700
+++ 8-jdk/slim/Dockerfile	2017-07-21 12:27:42.369410206 -0700
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM buildpack-deps:stretch-scm
+FROM debian:stretch-slim
 
 # A few reasons for installing distribution-provided OpenJDK:
 #
@@ -55,7 +55,7 @@
 	\
 	apt-get update; \
 	apt-get install -y \
-		openjdk-8-jdk="$JAVA_DEBIAN_VERSION" \
+		openjdk-8-jdk-headless="$JAVA_DEBIAN_VERSION" \
 		ca-certificates-java="$CA_CERTIFICATES_JAVA_VERSION" \
 	; \
 	rm -rf /var/lib/apt/lists/*; \
--- 9-jdk/Dockerfile	2017-07-21 12:27:42.369410206 -0700
+++ 9-jdk/slim/Dockerfile	2017-07-21 12:27:42.369410206 -0700
@@ -4,7 +4,7 @@
 # PLEASE DO NOT EDIT IT DIRECTLY.
 #
 
-FROM buildpack-deps:sid-scm
+FROM debian:sid-slim
 
 # A few reasons for installing distribution-provided OpenJDK:
 #

[tianon]

$ diff -u <(bashbrew list openjdk | cut -d: -f2) <(bashbrew list <(./generate-stackbrew-library.sh) | cut -d: -f2)
--- /dev/fd/63	2017-07-21 12:29:15.244751985 -0700
+++ /dev/fd/62	2017-07-21 12:29:15.245751956 -0700
@@ -2,18 +2,30 @@
 6b38
 6-jdk
 6
+6b38-jdk-slim
+6b38-slim
+6-jdk-slim
+6-slim
 6b38-jre
 6-jre
+6b38-jre-slim
+6-jre-slim
 7u131-jdk
 7u131
 7-jdk
 7
+7u131-jdk-slim
+7u131-slim
+7-jdk-slim
+7-slim
 7u131-jdk-alpine
 7u131-alpine
 7-jdk-alpine
 7-alpine
 7u131-jre
 7-jre
+7u131-jre-slim
+7-jre-slim
 7u131-jre-alpine
 7-jre-alpine
 8u131-jdk
@@ -22,20 +34,26 @@
 8
 jdk
 latest
+8u131-jdk-slim
+8u131-slim
+8-jdk-slim
+8-slim
+jdk-slim
+slim
 8u131-jdk-alpine
 8u131-alpine
 8-jdk-alpine
 8-alpine
 jdk-alpine
 alpine
-8u131-jdk-windowsservercore
-8u131-windowsservercore
+8u141-jdk-windowsservercore
+8u141-windowsservercore
 8-jdk-windowsservercore
 8-windowsservercore
 jdk-windowsservercore
 windowsservercore
-8u131-jdk-nanoserver
-8u131-nanoserver
+8u141-jdk-nanoserver
+8u141-nanoserver
 8-jdk-nanoserver
 8-nanoserver
 jdk-nanoserver
@@ -43,6 +61,9 @@
 8u131-jre
 8-jre
 jre
+8u131-jre-slim
+8-jre-slim
+jre-slim
 8u131-jre-alpine
 8-jre-alpine
 jre-alpine
@@ -50,6 +71,10 @@
 9-b177
 9-jdk
 9
+9-b177-jdk-slim
+9-b177-slim
+9-jdk-slim
+9-slim
 9-b154-jdk-windowsservercore
 9-b154-windowsservercore
 9-jdk-windowsservercore
@@ -60,3 +85,5 @@
 9-nanoserver
 9-b177-jre
 9-jre
+9-b177-jre-slim
+9-jre-slim