Add concurrency to ci pipeline

[ChromaChroma]

Add concurrency to ci tests in case of a quick succession of pushes of a pull request branch

[github-actions]

JaCoCo Test Coverage

There is no coverage information present for the Files changed

Total Project Coverage	38.49%	❌

[github-actions]

Test Results

  23 files  ±0    23 suites  ±0   10s ⏱️ ±0s
193 tests ±0  193 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
195 runs  ±0  195 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 70e06ab. ± Comparison against base commit 416930d.

This pull request removes 4 and adds 4 tests. Note that renamed tests count towards both.

com.tungstun.bill.domain.bill.OrderTest ‑ [1] expectedValue=2.0, amountOfProducts=1, product=com.tungstun.bill.domain.product.Product@339e6538
com.tungstun.bill.domain.bill.OrderTest ‑ [2] expectedValue=4.0, amountOfProducts=2, product=com.tungstun.bill.domain.product.Product@673faddf
com.tungstun.bill.domain.bill.OrderTest ‑ [3] expectedValue=0.0, amountOfProducts=1, product=com.tungstun.bill.domain.product.Product@5cbf2d80
com.tungstun.bill.domain.bill.OrderTest ‑ [4] expectedValue=0.0, amountOfProducts=2, product=com.tungstun.bill.domain.product.Product@2c93fefb

com.tungstun.bill.domain.bill.OrderTest ‑ [1] expectedValue=2.0, amountOfProducts=1, product=com.tungstun.bill.domain.product.Product@4249c1c6
com.tungstun.bill.domain.bill.OrderTest ‑ [2] expectedValue=4.0, amountOfProducts=2, product=com.tungstun.bill.domain.product.Product@7035a867
com.tungstun.bill.domain.bill.OrderTest ‑ [3] expectedValue=0.0, amountOfProducts=1, product=com.tungstun.bill.domain.product.Product@15ce83a8
com.tungstun.bill.domain.bill.OrderTest ‑ [4] expectedValue=0.0, amountOfProducts=2, product=com.tungstun.bill.domain.product.Product@7034ba26