* Use binary for building docker image
In the previous workflow, we were building and testing twice: once for
the docker image and once for the test step. Now, we'll build a debug
version in the test step, then build a release version and finally copy
that into the docker image. This would heavily reduce our build times.
* Ignore specific files in target to speed up builds
* Build image only when pushed to next or tagged
* Fix build condition
Since both conditions have to evaluate to true, we'll need to use refs
while also matching against both `push` and `tag` events
Signed-off-by: Sayan Nandan <nandansayan@outlook.com>
We were previously using the ubuntu image and then manually installing
rust. From now on, we'll use the rust docker image instead to avoid huge
build times
Signed-off-by: Sayan Nandan <nandansayan@outlook.com>
Sayan Nandan