Fix version check for Java platformization

Allow changing the CPP Toolchain. (bazelbuild#955)

The cpp default toolchain on windows was hardset to cc-compiler-k8, which
is linux exclusive. Additionally it's quite common to need to change the
compiler being used.

The drawback of this approach is that it potentially creates many repetitive
equal cc_toolchains if you use the same container with multiple toolings installed.

Long term we could add multiple cpp toolchains to configs/, but so far the limited
amount of repetition isn't harmful.

Add release workflow & license headers (bazelbuild#938)

* Add go releaser config

* Minor change

* Remove tags

* Add tag script

* chmod

* fix script

* release config update

* remove tag script

* comments & license headers

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 4.0.0 (2021/01/22) (bazelbuild#933)

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 3.7.2 (2021/01/07) (bazelbuild#928)

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 3.7.1 (2020/11/26) (bazelbuild#921)

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 3.7.0 (2020/10/21) (bazelbuild#918)

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 3.6.0 (2020/10/07) (bazelbuild#916)

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 3.5.1 (2020/10/01) (bazelbuild#914)

Toolchain configs for marketplace.gcr.io/google/rbe-ubuntu16-04, Baze…

…l 3.5.0 (2020/09/03) (bazelbuild#910)