* gnu/services/cuirass.scm (<cuirass-configuration>)[specifications]:
Change default value to #~'().
(cuirass-shepherd-service): Remove conditional for "--specifications".
Use 'scheme-file' instead of 'plain-file'. Change file name to
"cuirass-specs.scm".
* doc/guix.texi (Continuous Integration): Change the example to use a
gexp where #:file refers to a file within Cuirass. Adjust
documentation.
* gnu/services/cuirass.scm (<cuirass-configuration>)[cuirass]: New
field.
(cuirass-shepherd-service): Honor it.
* doc/guix.texi (Continuous Integration): Document it.
The previous default value depended on the 'HOME' environment variable,
which happened to be unset. Thus, /.cache was being used.
* gnu/services/cuirass.scm (<cuirass-configuration>)[cache-directory]:
Change default value to "/var/cache/cuirass".
(cuirass-shepherd-service): Always pass "--cache-directory".
(cuirass-activation): New procedure.
(cuirass-service-type): Use it as an extension to
ACTIVATION-SERVICE-TYPE.
* doc/guix.texi (Continuous Integration): Adjust accordingly.
* gnu/services/cuirass.scm (<cuirass-configuration>): Change type of
'specifications' field to an alist to match the documentation example.
(cuirass-shepherd-service): Store the provided specifications in a file. Use
that file as the "--specification" argument.
