🛠️ Fix: Prevent "Interrupted system call" when writing to /etc/apk/repositories

[Sn0w3y]

📌 Summary

This PR fixes a sporadic build failure during multi-arch Docker builds (linux/amd64, linux/arm64) caused by a race condition when writing to /etc/apk/repositories using echo. The error message was:

/bin/sh: can't create /etc/apk/repositories: Interrupted system call

✅ Solution

Replaced the fragile echo approach with a more robust sequence that ensures directories and files exist and uses printf instead:

Before

RUN wget -O /etc/apk/keys/adoptium.rsa.pub https://packages.adoptium.net/artifactory/api/security/keypair/public/repositories/apk && \
    echo 'https://packages.adoptium.net/artifactory/apk/alpine/main' >> /etc/apk/repositories

After

RUN mkdir -p /etc/apk/keys && \
    wget -O /etc/apk/keys/adoptium.rsa.pub https://packages.adoptium.net/artifactory/api/security/keypair/public/repositories/apk && \
    touch /etc/apk/repositories && \
    printf '%s\n' 'https://packages.adoptium.net/artifactory/apk/alpine/main' >> /etc/apk/repositories

📦 Result

• Fixed build failure on multi-architecture builds
• Improved reliability and reproducibility of Docker image builds

As seen in:

https://github.com/OpenEMS/openems/actions/runs/18647900625/job/53164486257

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3368      +/-   ##
=============================================
+ Coverage      59.80%   59.82%   +0.02%     
  Complexity       112      112              
=============================================
  Files           2787     2787              
  Lines         121037   121037              
  Branches        9061     9061              
=============================================
+ Hits           72378    72396      +18     
+ Misses         45947    45934      -13     
+ Partials        2712     2707       -5     

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[da-Kai]

You should then add this to the edge Dockerfile aswell.

[Sn0w3y]

@da-Kai done ! :)