Skip querying all instances w/ "test mode"

Now allows setting FARSIDE_TEST to skip individually fetching each
instance, and instead just adds all of them to redis instantly. This
allows for an easier time in CI builds, for both the sake of speed and
to prevent a scenario where many simultaneous builds have a noticeable
impact on actual instances.

.github/workflows/elixir.yml

@@ -14,18 +14,28 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+
     - name: Set up Elixir
       uses: erlef/setup-elixir@885971a72ed1f9240973bd92ab57af8c1aa68f24
       with:
         elixir-version: '1.10.3'
         otp-version: '22.3'
+
     - name: Restore dependencies cache
       uses: actions/cache@v2
       with:
         path: deps
         key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
         restore-keys: ${{ runner.os }}-mix-
+
+    - name: Start Redis
+      uses: supercharge/redis-github-action@1.2.0
+
     - name: Install dependencies
       run: mix deps.get
+
+    - name: Initialize services
+      run: FARSIDE_TEST=1 mix run update.exs
+
     - name: Run tests
       run: mix test

update.exs

@@ -19,12 +19,17 @@ defmodule Instances do
   end
 
   def request(url) do
-    case HTTPoison.get(url) do
-      {:ok, %HTTPoison.Response{status_code: 200}} ->
-        # TODO: Add validation of results, not just status code
+    cond do
+      System.get_env("FARSIDE_TEST") ->
         :good
-      _ ->
-        :bad
+      true ->
+        case HTTPoison.get(url) do
+          {:ok, %HTTPoison.Response{status_code: 200}} ->
+            # TODO: Add validation of results, not just status code
+            :good
+          _ ->
+            :bad
+        end
     end
   end