fix: add git safe.directory and refactor git config to shell script to resolve dubious ownership error (#39771)

* Initial plan

* Initial plan for safe.directory fix

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: add git safe.directory to prevent dubious ownership error in safe_outputs job

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: configure git safe.directory in gh-aw-node Dockerfile

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* refactor: extract git config to shell script, run in gh-aw-node container entrypoint

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: use GITHUB_REPOSITORY and GIT_SERVER_URL env vars in git credentials step

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: use GITHUB_SERVER_URL instead of GIT_SERVER_URL

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: add --no-auth flag to configure_git_credentials.sh for safeoutputs container

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: remove GITHUB_SERVER_URL from safeoutputs MCP env and drop --no-auth flag

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: set execute bit on configure_git_credentials.sh

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: add bash to gh-aw-node Dockerfile for configure_git_credentials.sh

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: create sh entrypoint script for safeoutputs container, revert bash from Dockerfile

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: use -c flag in safeoutputs entrypoint to expand RUNNER_TEMP variable

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

* fix: redirect configure_git_credentials.sh stdout to stderr to prevent MCP protocol corruption

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Co-authored-by: Peli de Halleux <pelikhan@users.noreply.github.com>

Author: Copilot