Switch from Travis-CI to Github Actions

Author: sfan5

.github/workflows/build.yml

@@ -0,0 +1,51 @@
+name: build
+
+# build on c/cpp changes or workflow changes
+on:
+  push:
+    paths:
+      - '**.[ch]'
+      - '**.cpp'
+      - '**/CMakeLists.txt'
+      - '.github/workflows/**.yml'
+  pull_request:
+    paths:
+      - '**.[ch]'
+      - '**.cpp'
+      - '**/CMakeLists.txt'
+      - '.github/workflows/**.yml'
+
+jobs:
+  gcc:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install deps
+        run: |
+          source util/ci/script.sh
+          install_linux_deps
+
+      - name: Build
+        run: |
+          source util/ci/script.sh
+          run_build
+        env:
+          CC: gcc
+          CXX: g++
+
+  clang:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install deps
+        run: |
+          source util/ci/script.sh
+          install_linux_deps
+
+      - name: Build
+        run: |
+          source util/ci/script.sh
+          run_build
+        env:
+          CC: clang
+          CXX: clang++

.travis.yml

@@ -1,13 +1,13 @@
 Minetest Mapper C++
 ===================
 
-.. image:: https://travis-ci.org/minetest/minetestmapper.svg?branch=master
-    :target: https://travis-ci.org/minetest/minetestmapper
+.. image:: https://github.com/minetest/minetestmapper/workflows/build/badge.svg
+    :target: https://github.com/minetest/minetestmapper/actions/workflows/build.yml
 
 Minetestmapper generates an overview image from a Minetest map.
 
-A port of minetestmapper.py to C++ from https://github.com/minetest/minetest/tree/master/util.
-This version is both faster and provides more features than the now deprecated Python script.
+A port of minetestmapper.py to C++ from https://github.com/minetest/minetest/tree/0.4.17/util.
+This version is both faster and provides more features than the now obsolete Python script.
 
 Requirements
 ------------

README.rst

@@ -0,0 +1,15 @@
+#!/bin/bash -e
+
+install_linux_deps() {
+	local pkgs=(cmake libgd-dev libsqlite3-dev libleveldb-dev libpq-dev libhiredis-dev)
+
+	sudo apt-get update
+	sudo apt-get install -y --no-install-recommends ${pkgs[@]} "$@"
+}
+
+run_build() {
+	cmake . -DCMAKE_BUILD_TYPE=Debug \
+		-DENABLE_LEVELDB=1 -DENABLE_POSTGRESQL=1 -DENABLE_REDIS=1
+
+	make -j2
+}