Build sdist inside of a container

A lot of people have experienced issues with the system-level dependencies that are required in order to build the source distribution that is handed off to the image builds. This makes it unnecessary to install any additional software on the host machine aside from Ansible and Docker.

installer/image_build/tasks/main.yml

@@ -47,12 +47,22 @@
   when: not sdist.stat.exists
   delegate_to: localhost
 
+- name: Build sdist builder image
+  docker_image:
+    path: "image_build/files"
+    dockerfile: Dockerfile.sdist
+    name: awx_sdist_builder
+    tag: "{{ awx_version }}"
+    force: true
+
 - name: Build AWX distribution
-  shell: make sdist
-  args:
-    chdir: ..
-    creates: "./dist/{{ awx_sdist_file }}"
-  delegate_to: localhost
+  docker_container:
+    image: "awx_sdist_builder:{{ awx_version }}"
+    name: awx_sdist_builder
+    state: started
+    detach: false
+    volumes:
+      - ../:/awx
 
 - name: Set docker build base path
   set_fact: