Remove dependency on openssl

Uses instead a fully rust-native TLS stack, which makes cross-compiling
much easier.

Also improves the `Makefile` to work better with docker

Author: staticfloat

.github/workflows/CI.yml

@@ -9,10 +9,13 @@ on:
     tags:
       - 'v*.*.*'
 
+env:
+  USE_DOCKER: true
+
 jobs:
   style:
     name: Check Style
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v1
@@ -35,7 +38,7 @@ jobs:
   test:
     name: Test
     needs: [style]
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v1
@@ -59,7 +62,7 @@ jobs:
     name: deploy
     needs: [test]
     if: startsWith(github.ref, 'refs/tags/')
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     strategy: 
       matrix:
         target: [ aarch64-unknown-linux-gnu, armv7-unknown-linux-gnueabihf, i686-unknown-linux-gnu, i686-unknown-linux-musl, powerpc64-unknown-linux-gnu, powerpc64le-unknown-linux-gnu, arm-unknown-linux-gnueabi, x86_64-unknown-linux-gnu, x86_64-unknown-linux-musl ]