Move basic workflow integration test from Dockerfile to go

[stanislas-m]

Make sure we don't break anything before merging #1252

[codecov]

Codecov Report

Merging #1247 into development will increase coverage by 0.35%.
The diff coverage is 46.96%.

@@               Coverage Diff               @@
##           development    #1247      +/-   ##
===============================================
+ Coverage        53.91%   54.26%   +0.35%     
===============================================
  Files               75       75              
  Lines             3437     3490      +53     
===============================================
+ Hits              1853     1894      +41     
+ Misses            1486     1482       -4     
- Partials            98      114      +16

Impacted Files	Coverage Δ
buffalo/cmd/build.go	55.55% <46.96%> (+18.59%)	⬆️
buffalo/cmd/root.go	56% <0%> (+12%)	⬆️

---

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[codecov]

Codecov Report

Merging #1247 into development will increase coverage by 0.41%.
The diff coverage is 46.96%.

@@               Coverage Diff               @@
##           development    #1247      +/-   ##
===============================================
+ Coverage        53.85%   54.26%   +0.41%     
===============================================
  Files               75       75              
  Lines             3452     3490      +38     
===============================================
+ Hits              1859     1894      +35     
+ Misses            1492     1482      -10     
- Partials           101      114      +13

Impacted Files	Coverage Δ
buffalo/cmd/build.go	55.55% <46.96%> (+18.59%)	⬆️
generators/newapp/new.go	0% <0%> (ø)	⬆️
errors.go	76.08% <0%> (+0.01%)	⬆️
meta/app.go	48.35% <0%> (+3.19%)	⬆️
app.go	100% <0%> (+7.69%)	⬆️
buffalo/cmd/root.go	56% <0%> (+12%)	⬆️
route_info.go	79.31% <0%> (+16.81%)	⬆️

---

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[codecov]

Codecov Report

Merging #1247 into development will increase coverage by 0.27%.
The diff coverage is 38.75%.

@@               Coverage Diff               @@
##           development    #1247      +/-   ##
===============================================
+ Coverage        53.83%   54.11%   +0.27%     
===============================================
  Files               75       75              
  Lines             3453     3511      +58     
===============================================
+ Hits              1859     1900      +41     
- Misses            1493     1494       +1     
- Partials           101      117      +16

Impacted Files	Coverage Δ
generators/resource/resource.go	0% <0%> (ø)	⬆️
buffalo/cmd/build.go	55.55% <46.96%> (+18.59%)	⬆️
buffalo/cmd/root.go	56% <0%> (+12%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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