testing/airsonic: use explicit java version in init script

8 jobs for !22463 with airsonic in 133 minutes and 53 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #419180
docker-alpine x86_64
lint

00:00:18

 
  Build
passed #419185
docker-alpine ci-build aarch64
build-aarch64

00:00:56

passed #419187
docker-alpine ci-build armhf
build-armhf

01:48:56

passed #419186
docker-alpine ci-build armv7
build-armv7

01:50:51

passed #419184
docker-alpine ci-build ppc64le
build-ppc64le

00:21:46

passed #419183
docker-alpine ci-build s390x
build-s390x

01:33:02

passed #419182
docker-alpine ci-build x86
build-x86

00:08:20

passed #419181
docker-alpine ci-build x86_64
build-x86_64

00:06:46