ifx: log line to display build version

* fixed missing error handler in main
* add injectable build string in main
* add (dynamically linked) docker build
* add github CI workflow
* add extra but useful dev files in dev folder

.dockerignore

@@ -10,4 +10,4 @@
 !/LICENSE
 !/README.md
 !/go.*
-!/.env.example
+!/.env

.github/workflows/docker.yaml

@@ -45,7 +45,9 @@ jobs:
         with:
           context: ./
           file: ./Dockerfile
-          platforms: linux/amd64
+          platforms:
+            - linux/amd64
+            - linux/arm64
           push: true
           build-args: |
             BUILD=${{ env.RELEASE_SHORT_COMMIT }}

Dockerfile

@@ -33,8 +33,7 @@ COPY --from=build /build/ussd-africastalking .
 COPY --from=build /build/LICENSE .
 COPY --from=build /build/README.md .
 COPY --from=build /build/services ./services
-COPY --from=build /build/.env.example .
-RUN mv .env.example .env
+COPY --from=build /build/.env .
 
 EXPOSE 7123