version latest, 0.3.1 & 0.3.2 is broken

[wuxxin]

• Version used: docker pull ncabatoff/process-exporter

• Even 0.3.1 and 0.3.2 are listed as prerelease on the github release page,
  the latest tag on dockerhub is pointing to 0.3.2.

• Unfortunately 0.3.x are broken.

• reproduction:

root@schulung:~# docker run --rm -i ncabatoff/process-exporter:0.2.12
2018/08/10 11:01:17 Reading metrics from /proc for procnames: []
root@schulung:~# docker run --rm -i ncabatoff/process-exporter:0.3.1 
standard_init_linux.go:178: exec user process caused "no such file or directory"
root@schulung:~# docker run --rm -i ncabatoff/process-exporter:0.3.2 
standard_init_linux.go:178: exec user process caused "no such file or directory"
root@schulung:~# docker run --rm -i ncabatoff/process-exporter:latest
standard_init_linux.go:178: exec user process caused "no such file or directory"

[ncabatoff]

Thanks very much for the detailed and timely bug report. It's fixed in v0.3.6.

I've added a 'stable' tag to the images (currently pointing to v0.2.12) which I will manually move when I consider a release to be ready, until I find a better solution. I've also added more checks to prevent this kind of breakage from happening in future.

[wuxxin]

thank you for your quick response and fixing 👍 , i will use the stable tag, good idea 🥇