🔥Remove the image architecture

Since the architecture name has now changed to `amd64`
instead of `x64_64`.

This partially reverts
EVerest@b0dfa4d

Additional details at:
EVerest#78 (comment)

Testing done:
- Before this change `docker compose -f docker-compose.build.yml build` errors out
- After this change `docker compose -f docker-compose.build.yml build` does not error out at the same step

Signed-off-by: Shankari <[email protected]>

manager/Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=linux/x86_64 ghcr.io/everest/build-kit-alpine:1.4.2
+FROM ghcr.io/everest/build-kit-alpine
 
 ARG EVEREST_VERSION=2024.9.0
 ENV EVEREST_VERSION=${EVEREST_VERSION}