Run on ubuntu latest

.github/workflows/main.yaml

@@ -26,21 +26,16 @@ on:
   workflow_dispatch:
 
 jobs:
-  test:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-18.04, ubuntu-20.04]
+  basic-test:
+    runs-on: ubuntu-latest
     env:
       CMAKE_C_COMPILER: gcc
     steps:
       - uses: actions/checkout@v2
       - name: install dependencies on ubuntu
-        if: ${{ startsWith(matrix.os, 'ubuntu') }}
-        run: sudo apt-get install -y libharfbuzz-dev
+        run: sudo ./tools/install-ubuntu-build-deps.sh
       - name: build
         run: |
-          mkdir -p build
           cmake -B build
           cmake --build build
       - name: run

tools/Containerfile

@@ -0,0 +1,7 @@
+FROM ubuntu:26.04
+
+COPY install-ubuntu-build-deps.sh /usr/local/bin
+
+RUN install-ubuntu-build-deps.sh
+
+

tools/install-ubuntu-build-deps.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+build_deps=(
+  build-essential
+  cmake
+  libfontconfig-dev
+  libharfbuzz-dev
+)
+
+export DEBIAN_FRONTEND="noninteractive"
+
+apt-get -U install -y "${build_deps[@]}"