feat: Adds arm64 docker image builds (#162)

# Description
Adds arm64 docker image builds to the test and publish workflows

# Issues
N/A (discussed via Matrix)

# Other Notes

---------

Co-authored-by: Daniel McKnight <34697904+NeonDaniel@users.noreply.github.com>

Author: dblencowe

.github/workflows/publish_release.yml

@@ -16,4 +16,5 @@ jobs:
     secrets: inherit
     with:
       base_tag: base
-      extra_tag: default_model
+      extra_tag: default_model
+      platforms: linux/amd64,linux/arm64

.github/workflows/publish_test_build.yml

@@ -21,4 +21,5 @@ jobs:
     secrets: inherit
     with:
       base_tag: base
-      extra_tag: default_model
+      extra_tag: default_model
+      platforms: linux/amd64,linux/arm64

.github/workflows/unit_tests.yml

@@ -12,6 +12,8 @@ jobs:
       python_version: "3.8"
   docker_build_tests:
     uses: neongeckocom/.github/.github/workflows/docker_build_tests.yml@master
+    with:
+      platforms: linux/amd64,linux/arm64
   unit_tests:
     timeout-minutes: 15
     strategy: