fix(golang): use commit hash and drop direct download workaround

- Pin Fedora spec to commit e0faaabdb2 instead of timestamp snapshot
- Remove source-files direct download now that lookaside cache is synced

Author: WithEnoughCoffee

.github/copilot-instructions.md

@@ -61,6 +61,10 @@ Run all commands from the repo root (where `azldev.toml` lives). If the terminal
 | Dump resolved config | `azldev config dump -q -O json` |
 | Advanced commands (like mock shell) | `azldev adv --help` (hidden from normal help) |
 
+## Commit Messages
+
+Do NOT add `Co-authored-by: Copilot` trailers to any commit messages.
+
 ## Repository Hygiene Rules
 
 1. **Overlay descriptions**: Every overlay MUST include a `description` field explaining *why* the change is needed.

base/comps/components-full.toml

@@ -532,7 +532,6 @@
 [components.gnustep-make]
 [components.go-vendor-tools]
 [components.gobject-introspection]
-# golang: moved to dedicated golang/golang.comp.toml (snapshot override for cert fix)
 [components.golang-github-burntsushi-toml]
 [components.golang-github-cpuguy83-md2man]
 [components.golang-github-evanw-esbuild]

base/comps/golang/golang.comp.toml

@@ -1,7 +1,9 @@
 [components.golang]
-# Override snapshot to pick up golang-1.25.8-1.fc43, which fixes an expired TLS test
+# Override to pick up golang-1.25.8-1.fc43, which fixes an expired TLS test
 # certificate in net/smtp that causes %check failures after 2026-03-18.
 # Upstream: https://github.com/golang/go/issues/77504
 # Backport: https://github.com/golang/go/issues/77531 (Go 1.25.8)
-# The default snapshot (2026-02-24) predates the Fedora f43 update (~Mar 6).
-spec = { type = "upstream", upstream-distro = { name = "fedora", version = "43", snapshot = "2026-03-10T00:00:00-08:00" } }
+# Fedora commit: https://src.fedoraproject.org/rpms/golang/c/e0faaabdb215feb6be2b3232f480a03ce76ca132?branch=f43
+# TODO: Drop this override once the default Fedora 43 snapshot
+# in distro/azurelinux.distro.toml advances past this commit.
+spec = { type = "upstream", upstream-distro = { name = "fedora", version = "43" }, upstream-commit = "e0faaabdb215feb6be2b3232f480a03ce76ca132" }