Create a basic Continuous Integration test

Run a program test at the end.

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: TerminalImageViewer CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "*" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Install dependencies
+      run: sudo apt-get install -qy imagemagick
+    - name: Build
+      run: make -C src
+    - name: Install
+      run: sudo make -C src install
+    - name: Test
+      run: tiv /usr/share/pixmaps/debian-logo.png