Rewrite project, add daily update of services list

The project was rewritten from Elixir to Go, primarily because:

- I don't write Elixir anymore and don't want to maintain a project in a
  language I no longer write
- I already write Go for other projects, including my day job, so it's
  a safer bet for a project that I want to maintain long term
- Go allows me to build portable executables that will make it easier
  for others to run farside on their own machines

The Go version of Farsside also has a built in task to fetch the latest
services{-full}.json file from the repo and ingest it, which makes
running a farside server a lot simpler.

It also automatically fetches the latest instance state from
https://farside.link unless configured as a primary farside node, which
will allow others to use farside without increasing traffic to all
instances that are queried by farside (just to the farside node itself).

.github/workflows/elixir.yml

@@ -1,38 +0,0 @@
-name: Elixir CI
-
-on:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-
-jobs:
-  build:
-
-    name: Build and test
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v3
-
-    - name: Set up Elixir
-      uses: erlef/setup-beam@v1
-      with:
-        elixir-version: '1.12.3'
-        otp-version: '24'
-
-    - name: Restore dependencies cache
-      uses: actions/cache@v3
-      with:
-        path: deps
-        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
-        restore-keys: ${{ runner.os }}-mix-
-
-    - name: Install dependencies
-      run: mix deps.get
-
-    - name: Initialize services
-      run: FARSIDE_TEST=1 FARSIDE_SERVICES_JSON=services-full.json mix run -e Farside.Instances.sync
-
-    - name: Run tests
-      run: FARSIDE_TEST=1 FARSIDE_SERVICES_JSON=services-full.json mix test --trace

.github/workflows/tests.yml

@@ -0,0 +1,19 @@
+on: [push, pull_request]
+name: Tests
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.21.x, 1.22.x, 1.23.x]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Test
+      run: go test -v ./...
+