feat(preload): experimental LD_PRELOAD env hook #28
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(instead of once per getenv call)
Also, convert all shell scripts to POSIX-compliant sh scripts and apply most shellcheck suggestions.
The previous build & test setup was invalid: So far we have built _different_ libdash0envhook.so binaries for the LD_PRELOAD hook per libc flavor. With this, the binary works in the target system. But actually this approach is not not possible in the real world. We can set one binary as LD_PRELOAD when instrumenting a container and we do not know which libc flavor it is ahead of time. Thus we ultimately need to build a libdash0envhook.so binary that works independently of which libc flavor the target system uses. This commit only fixes the test setup. The binary does not yet support both libc flavors. This will be handled in a follow up commit. [skip ci]
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