Fixes: #3327

and, in particular, matching client.ip against a vcl

Ref #3334

There is a problem with fakeroot-sysv on Ubuntu 20.04 aarch64:

Install Build-Depends packages...

+ mk-build-deps --install debian/control

+ yes

semop(1): encountered an error: Function not implemented

Error in the build process: exit status 1

That is, in the context of varnish.m4, because this changes existing
behavior in a way that breaks backward compatibility.

Partial revert of 134d0633.

This is to support generated vcc files with out-of-tree vmod builds.

our python sources use spaces

In order to build aarch64 packages it relies on the machine executors
feature based on QEMU. Since the same scripts were needed to build
packages for different architectures they were extracted in standalone
shell scripts.

Alpine Linux packages are now built in addition to RPM and Deb packages
but considering how long emulation takes for aarch64 packages, packaging
was moved to a nightly workflow.

Some changes happened in the pkg-varnish-cache repository to accomodate
the CircleCI reorganization, mainly around dependency management.

More information in the CircleCI README file.

Closes #3313
Reviewed-by: Guillaume Quintard <guillaume@varnish-software.com>
Signed-off-by: Dridi Boukelmoune <dridi.boukelmoune@gmail.com>

Ref #3311

See comments in #3311, but done slightly differently

This is an alternative implementation of #2680

Ref #3312

Closes #3312 (probably)

Fixes: #3266

vcc_compile.h is not generated
EXTRA_DIST is not necessarily generated

- missing dependencies in each of the both places of invocation
- vrt_obj.h is generated, so it cannot be a dependency at the same time

notice with out-of-tree parallel build

Copy paste the text from beresp.status to resp.status about the special
handling of status codes.

Some status codes are illegal and will cause VRT_fail() when executed as
normal set instructions in VCL. But this test is bypassed when status is
set as a side effect of a `return (synth(code))` statement.

This patch applies the same rules as when executing a set-instruction to
the return(synth()) handling.

Fixes second part of: #3301

The compound statement doing return() in VCL may have failed for some
reason, for example running out of workspace while putting together the
reason field. The fail handling would be overwritten by the forced
handling at the end of the generated code for a return statement.

This patch adds a test for the failure condition before forcing the
handling to the result of the return statement.

In VCL we allow status codes larger then 999, and do modulo 1000 when
sending it to the client. But the code to apply the modulo was missing in
H/2.

This issue was uncovered and reported by @Francois-v3.

Fixes first case of: #3301