Fix CentOS6 Docker build: replace wget with curl for git source download

[Copilot]

The CentOS6 Docker image build was failing because wget returned exit code 8 (server error response) when downloading the git 2.15.0 source tarball from kernel.org.

Changes

• roles/GIT_Source/tasks/main.yml: Replace wget -q -O with curl -fsSL -o in the CentOS 6-specific git source download task

# Before
shell: "wget -q -O /tmp/git-2.15.0.tar.xz https://www.kernel.org/pub/software/scm/git/git-2.15.0.tar.xz"

# After
shell: "curl -fsSL -o /tmp/git-2.15.0.tar.xz https://www.kernel.org/pub/software/scm/git/git-2.15.0.tar.xz"

curl is already used successfully throughout the CentOS6-Cent7SSL role (which runs earlier in the playbook and updates OpenSSL/CA certs on CentOS 6), making this the consistent and proven download tool for this environment.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• mirrors.edge.kernel.org
  • Triggering command: /usr/bin/curl curl -sIL REDACTED (dns block)
• www.kernel.org
  • Triggering command: /usr/bin/curl curl -sI REDACTED (dns block)
  • Triggering command: /usr/bin/curl curl -sIL REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)