Add initial GitHub Action

test/automations.yaml

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+---
+# Empty, which is fine for this example
+[]

test/configuration.yaml

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+---
+# Configure a default setup of Home Assistant (frontend, api, etc)
+default_config:
+
+# Automations to test an include
+automation: !include automations.yaml
+
+# Text to speech
+tts:
+  - platform: google_translate
+
+# Demo integration
+demo:
+
+# A sensor, useless, but ensures the fake secrets are loaded
+sensor:
+  - platform: otp
+    token: !secret frenck

test/fakesecrets.yaml

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+---
+frenck: SuperSecretPassword!123

test/secrets.yaml

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+---
+# This secrets file should be overwritten by the fake secret file.
+some_password: welcome