Add GitHub Action for building

- Add script to bootstrap GitHub action
- Build fonts
- Upload directory with built fonts as artifacts

Signed-off-by: Matej Focko <me@mfocko.xyz>

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Build Fira Code
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Build
+    steps:
+    - name: Checkout the latest commit
+      uses: actions/checkout@v2
+    - name: Install dependencies
+      run: bash -ex ./script/bootstrap_action
+    - name: Build fonts
+      run: bash -e ./script/build
+    - name: Upload built fonts
+      uses: actions/upload-artifact@v2
+      with:
+        name: Fira_Code
+        path: distr

script/bootstrap_action

@@ -0,0 +1,18 @@
+#! /bin/bash -ex
+
+sudo apt update
+sudo apt install -y python3.8 python3-setuptools python3.8-dev pkg-config zlib1g ttfautohint woff2 sfnt2woff-zopfli
+
+sudo python3.8 -m easy_install pip
+python3.8 -m pip install virtualenv --user
+python3.8 -m virtualenv venv
+source venv/bin/activate
+
+# https://github.com/googlefonts/gftools/issues/121
+python3.8 -m pip install -U Pillow==5.4.1 idna==2.8 requests==2.21.0 urllib3==1.24.1
+export PKG_CONFIG_PATH="/usr/local/opt/libffi/lib/pkgconfig"
+python3.8 -m pip install pycairo
+python3.8 -m pip install git+https://github.com/googlefonts/gftools
+
+python3.8 -m pip install fontmake
+python3.8 -m pip install fontbakery