Use Go 1.13

[ndeloof]

- What I did Bump build to use Go 1.13 (but for docker CLI, as golang-cross isn't available yet with 1.13)

- How I did it Separated CLI build from app build in Dockerfile

- How to verify it make all + CI build

- Description for the changelog Bump Golang to 1.13

- A picture of a cute animal (not mandatory but encouraged)

[codecov[bot]]

Codecov Report

Merging #720 into master will decrease coverage by 1.84%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #720      +/-   ##
==========================================
- Coverage    72.9%   71.05%   -1.85%     
==========================================
  Files          59       59              
  Lines        3351     3006     -345     
==========================================
- Hits         2443     2136     -307     
+ Misses        594      584      -10     
+ Partials      314      286      -28

Impacted Files	Coverage Δ
internal/store/bundle.go	68.93% <0%> (-12.09%)	:arrow_down:
internal/commands/build/build.go	61.14% <0%> (-8.31%)	:arrow_down:
internal/cnab/cnab.go	63.33% <0%> (-6.24%)	:arrow_down:
internal/commands/build/compose.go	82.85% <0%> (-6.04%)	:arrow_down:
types/parameters/parameters.go	92.06% <0%> (-4.77%)	:arrow_down:
internal/store/app.go	73.33% <0%> (-1.67%)	:arrow_down:
internal/commands/image/tag.go	88.88% <0%> (-1.31%)	:arrow_down:
internal/store/digest.go	86.36% <0%> (-0.82%)	:arrow_down:

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