Fix "Build containers" CI failure when repository has no git tags

[Copilot]

git describe --tags --match 'v*' exits with code 128 ("No names found, cannot describe anything") on repos without tags. With -Eeuo pipefail active, this kills the Build meta step, leaving VERSION unset and causing a downstream JSON parse error when the workflow tries to read bake metadata.

Changes

• .github/workflows/continuous-integration.yml: Make git describe non-fatal when no tags exist
  • Redirect stderr to /dev/null and append || true to the pipeline
  • Fall back to 0.0.0-dev when commit_version resolves to empty

-commit_version=$(git describe --tags --match 'v*' "${commit_sha}"| sed -e 's/^v//; ...')
+commit_version=$(git describe --tags --match 'v*' "${commit_sha}" 2>/dev/null | sed -e 's/^v//; ...' || true)
+if [[ -z "${commit_version}" ]]; then
+  commit_version="0.0.0-dev"
+fi

Consistent with the existing || : guard already used on the git log line directly above.