Add an example layer and build it in the CI (as a test)

Author: jacksgt

.github/workflows/pythonapp.yml

@@ -26,3 +26,8 @@ jobs:
 #      run: |
 #        pip install pytest
 #        pytest
+    - name: Build example layer
+      run: |
+        cd tests/numpy/
+        ../../layer-tool.py --build awesome-numpy
+        du -h awesome-numpy.zip

README.md

@@ -1,5 +1,7 @@
 # Lambda Layer Tool
 
+![Build status](https://github.com/jacksgt/lambda-layer-tool/workflows/Python%20application/badge.svg?branch=master)
+
 A tool to programmatically build and publish Layers for AWS Lambda.
 
 Instead of manually copy & pasting build instructions for a Lambda Layer into your shell or trying to script your way around, use this tool to automate the process.

tests/numpy/layers.yaml

@@ -0,0 +1,14 @@
+---
+version: '0.3'
+layers:
+  awesome-numpy:
+    description: 'Minimal numpy 1.18 for python3.7'
+    runtimes: 'python3.7'
+    requirements:
+      - 'numpy==1.18.2'
+    excludes:
+      - '*/numpy/tests/*'
+      - '*.dist-info/*'
+      - '*.egg-info/*'
+      - '*/__pycache__/*'
+      - '*.pyc'