Updated Github Actions, Fixed Dockerfile

- Updated the Github Actions to build just one binary with all DB
  Backends.

- Created a hadolint workflow to check and verify Dockerfiles.
- Fixed current hadolint errors.
- Fixed a bug in the Dockerfile.j2 which prevented the correct libraries
  and tools to be installed on the Alpine images.

- Deleted travis.yml since that is not used anymore

docker/arm32v7/Dockerfile.alpine

@@ -77,6 +77,7 @@ RUN [ "cross-build-start" ]
 RUN apk add --no-cache \
         openssl \
         curl \
+        sqlite \
         ca-certificates
 RUN apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/community catatonit