fix: pin golang alpine instead of latest

[#187010312](https://www.pivotaltracker.com/story/show/187010312)

`golang:latest` is based on debian instead of alpine. Since we were using golang:1.22.0-alpine before we should keep using latest version of alpine `golang:alpine`.

This Dockerfile definitely needs Alpine since we perform some APK operations: #957

Also, we must keep in mind that there might be differences in the golang binaries, since Alpine binaries tend to be statically linked against MUSL instead of glibc: golang/go#62053

We might want to keep an eye on this topic to ensure our binaries are always built in a consistent way.

Thank you very much @zucchinidev 🥇 for noticing this error and letting me know :)

Keep up the good work!

Co-authored-by: Andrea Zucchini <[email protected]>

Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:latest AS build
+FROM golang:alpine AS build
 RUN apk update
 RUN apk upgrade
 RUN apk add --update gcc g++