Remove alpine variants

Since the base image no longer provides them.

library/jruby

@@ -7,18 +7,10 @@ Tags: latest, 9, 9.2, 9.2.7, 9.2-jre, 9.2.7-jre, 9.2.7.0, 9.2.7.0-jre
 Architectures: amd64, i386, arm32v5, arm64v8, ppc64le, s390x
 Directory: 9000/jre
 
-Tags: 9-alpine, 9.2-alpine, 9.2.7-alpine, 9.2-jre-alpine, 9.2.7-jre-alpine, 9.2.7.0-alpine, 9.2.7.0-jre-alpine
-Architectures: amd64, arm64v8, ppc64le, s390x
-Directory: 9000/alpine-jre
-
 Tags: 9-jdk, 9.2-jdk, 9.2.7-jdk, 9.2.7.0-jdk
 Architectures: amd64, i386, arm32v5, arm64v8, ppc64le, s390x
 Directory: 9000/jdk
 
-Tags: 9-jdk-alpine, 9.2-jdk-alpine, 9.2.7-jdk-alpine, 9.2.7.0-jdk-alpine
-Architectures: amd64, arm64v8, ppc64le, s390x
-Directory: 9000/alpine-jdk
-
 Tags: 9-onbuild, 9.2-onbuild, 9.2.7-onbuild, 9.2.7.0-onbuild
 Architectures: amd64, i386, arm32v5, arm64v8, ppc64le, s390x
 Directory: 9000/onbuild
@@ -30,18 +22,6 @@ Directory: 9000/jre
 GitCommit: 8bc3fe27670a851953345182fe12f14f5e708383
 GitFetch: refs/heads/9.1
 
-Tags: 9.1-alpine, 9.1.17-alpine, 9.1.17.0-alpine, 9.1-jre-alpine, 9.1.17-jre-alpine, 9.1.17.0-jre-alpine
-Architectures: amd64, arm64v8, ppc64le, s390x
-Directory: 9000/alpine-jre
-GitCommit: 8bc3fe27670a851953345182fe12f14f5e708383
-GitFetch: refs/heads/9.1
-
-Tags: 9.1-jdk-alpine, 9.1.17-jdk-alpine, 9.1.17.0-jdk-alpine
-Architectures: amd64, arm64v8, ppc64le, s390x
-Directory: 9000/alpine-jdk
-GitCommit: 8bc3fe27670a851953345182fe12f14f5e708383
-GitFetch: refs/heads/9.1
-
 Tags: 9.1-jdk, 9.1.17-jdk, 9.1.17.0-jdk
 Architectures: amd64, i386, arm32v5, arm64v8, ppc64le, s390x
 Directory: 9000/jdk