Add ability to specify Agora's SDK build URL

bundlex.exs

@@ -14,10 +14,25 @@ defmodule Membrane.Agora.BundlexProject do
 
   def project do
     case get_target() do
-      %{os: "linux"} ->
-        System.shell("./install.sh")
+      %{os: "linux", architecture: :x86_64} ->
+        System.shell("./install.sh https://download.agora.io/sdk/release/Agora-RTC-x86_64-linux-gnu-v3.8.202.20-20220627_152601-214165.tgz")
+
       other_target ->
-        IO.warn("Agora's Server Gateway SDK is unavailable for this target: #{inspect(other_target)}")
+        url = System.get_env("AGORA_SDK_URL")
+        if url do
+          {_output, result} = System.shell("./install.sh #{url}")
+          if result != 0 do
+            IO.warn("""
+            Couldn't fetch SDK from the following URL: #{url}
+            """)
+          end
+        else
+          IO.warn("""
+          Agora's Server Gateway SDK build location unknown for target #{inspect(other_target)}.
+          You can pass the URL as AGORA_SDK_URL environmental variable.
+          """)
+        end
+
     end
 
     [

install.sh

@@ -1,9 +1,7 @@
 #! /bin/bash
 
 if ! test -d ./agora_sdk; then
-    wget https://download.agora.io/sdk/release/Agora-RTC-x86_64-linux-gnu-v3.8.202.20-20220627_152601-214165.tgz
-    tar xvf Agora-RTC-x86_64-linux-gnu-v3.8.202.20-20220627_152601-214165.tgz
-    rm  Agora-RTC-x86_64-linux-gnu-v3.8.202.20-20220627_152601-214165.tgz
+    wget -qO- $1 | tar xvz 
     mv agora_rtc_sdk/agora_sdk .
     rm -r agora_rtc_sdk
 fi