Add sds as a submodule

.github/workflows/main.yml

@@ -0,0 +1,23 @@
+name: build
+
+on:
+ push:
+   branches: [ master ]
+ pull_request:
+   branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: addnab/docker-run-action@v3
+        with: 
+            options: -v ${{ github.workspace }}:/usr/src/pam_aad
+            image: ghcr.io/aad-for-linux/pam_aad:ubuntu
+            run: |
+              cd /usr/src/pam_aad
+              ./bootstrap.sh
+              ./configure
+              make

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "sds"]
+	path = sds
+	url = https://github.com/aad-for-linux/sds.git

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+    "files.associations": {
+        "pam_modules.h": "c",
+        "pam_appl.h": "c"
+    }
+}