Upgrade docker images in dockerfile

[alpe]

• Fixes failing docker build
• Enables docker build for all branches

[ethanfrey]

Interesting this is needed.
I need to dig into the genealogy of all the golang/alpine combinations sometime

[ethanfrey]

Looking at the build failure...

"Setup a remote docker engine"

Server Engine Details:
  Version:          17.09.0-ce
  API version:      1.32 (minimum version 1.12)
  Go version:       go1.8.3
  Git commit:       afdb6d4
  Built:            2017-09-26T22:40:56.000000000+00:00
  OS/Arch:          linux/amd64
  Experimental:     false

Think this is a version issue?

[ethanfrey]

Bisecting when docker broke in master, I found this:

[ethanfrey]

The last working one had the same docker engine

[codecov]

Codecov Report

Merging #733 (f15de7b) into master (d500cb3) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head f15de7b differs from pull request most recent head 848eb35. Consider uploading reports for the commit 848eb35 to get more accurate results

@@            Coverage Diff             @@
##           master     #733      +/-   ##
==========================================
- Coverage   58.36%   58.32%   -0.04%     
==========================================
  Files          49       49              
  Lines        5807     5807              
==========================================
- Hits         3389     3387       -2     
- Misses       2169     2170       +1     
- Partials      249      250       +1     

Impacted Files	Coverage Δ
x/wasm/keeper/keeper.go	87.54% <0.00%> (-0.36%)	⬇️

[alpe]

The "issue" was introduced with the alpine image upgrade. The remote docker version became incompatible. See https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.14.0#faccessat2 for details

[ethanfrey]

I think you merged without the filters.

We should get those back (one more PR before tagging)

[ethanfrey]

We need these back!