Initial tox and gitbub actions: avoid getting stale css

.github/workflows/tests.yml

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+name: customer themes
+
+on:
+  push:
+    branches: ['juniper/tahoe']
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        python-version: [3.8]
+        tox-env:
+          - verify
+    steps:
+     - uses: actions/checkout@v2
+     - name: Set up Python ${{ matrix.python-version }}
+       uses: actions/setup-python@v2
+       with:
+         python-version: ${{ matrix.python-version }}
+     - name: Install dependencies
+       run: |
+         pip install tox
+     - name: Test with tox
+       run: tox -e ${{ matrix.tox-env }}

.gitignore

@@ -1 +1,2 @@
 .DS_Store
+.tox

README.md

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+# Customer-specific theme
+This repo has the customer themes.
+
+## How to: Compile the `amc-specific.scss` file
+
+On your devstack run:
+
+```
+$ tox -e compile
+```
+
+Commit the changes and make a pull request.

scripts/compile.sh

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+#!/usr/bin/env bash
+set -ex
+
+# Run via `tox -e compile`
+pysassc cms/static/sass/amc-specific.scss cms/static/css/amc-specific.css

scripts/verify.sh

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+#!/usr/bin/env bash
+set -ex
+
+# Run this script via `$ tox -e verify`
+if git diff-index --quiet HEAD --; then
+  echo "Success: The CSS file is in sync with the SCSS file."
+else
+  echo "Error: CSS is out of sync"
+  echo "=== Start: Git diff ==="
+  git --no-pager diff
+  echo "=== End: Git diff ==="
+  echo 'Error: The CSS file is out of sync with the SCSS file.'
+  echo 'The git diff above shows the difference.'
+  echo 'Please use "$ tox -e compile" locally to compile the SCSS file.'
+fi

tox.ini

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+[tox]
+envlist = compile,verify
+skipsdist = True
+
+[testenv]
+basepython=python3
+deps = libsass==0.20.1
+allowlist_externals =
+    bash
+
+[testenv:compile]
+commands =
+    bash {toxinidir}/scripts/compile.sh
+
+[testenv:verify]
+commands =
+    bash {toxinidir}/scripts/compile.sh
+    bash {toxinidir}/scripts/verify.sh
+