fix: setup go with the correct version in nix GHA

[frewilhelm]

The nix GHA is failing since some time because

go: go.mod requires go >= 1.25.7 (running go 1.25.6; GOTOOLCHAIN=local)
error: Cannot build '/nix/store/1arisjbbjkpskw54dw6bc6yxk0n6l5n5-ocm-0.38.0-dev-go-modules.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/is2w1y4jiq77cs23sn4p80ghg7dpks4g-ocm-0.38.0-dev-go-modules
       Last 8 log lines:
       > Running phase: unpackPhase
       > unpacking source archive /nix/store/dgf3q1lwrymkbkrqfjhl3khxc5n1qmjw-4bll3adr8nm188wb6r8i22ga5czqvpm5-source
       > source root is 4bll3adr8nm188wb6r8i22ga5czqvpm5-source
       > Running phase: patchPhase
       > Running phase: updateAutotoolsGnuConfigScriptsPhase
       > Running phase: configurePhase
       > Running phase: buildPhase
       > go: go.mod requires go >= 1.25.7 (running go 1.25.6; GOTOOLCHAIN=local)

Currently, go is installed via nix and apparently there is no version 1.25.7 available.

By using go version 1.26 the workflow runs again

[frewilhelm]

Unfortunately, this won't fix the workflow

[hilmarf]

Unfortunately, this won't fix the workflow

maybe @vasu1124 can jump in here :-) ?

And I'm not sure, but it looks, like nix supports now also:

  go_latest = go_1_26;
  buildGoLatestModule = buildGo126Module;

so it might work, when you change that in https://github.com/open-component-model/ocm/blob/main/flake.nix#L33 and https://github.com/open-component-model/ocm/blob/main/flake.nix#L95

[frewilhelm]

And I'm not sure, but it looks, like nix supports now also:

Good catch - that worked on my fork. Thanks!