devops-0.4: Add git-tag-create-options.

devops-0.4: Add git-tag-create-options.

NEWS: Fix formatting of 0.3 entry.

build.scm: Use set-file-modes! rather than execing chmod.

build.scm (build-core-pkg): Delete build directory upon success.

build.scm (build-plugin-dpkg): Set .buildinfo and dbgsym .ddeb read-only.

devops.scm (git-tag-create-options): New variable to config tag signing.

devops.scm (release-core, release-plugin): Use new variable to config
tag signing.