Overhaul build CI. (#11699)

* Overhaul build CI.

This makes a number of changes that make our build CI easier to maintain
and much safer with respect to the possibility of accidentally pushing
broken nightlies.

* The release-build.yml workflow has been renamed to just build.yml
* The updater.yml and build-and-install.yml workflows have been
  consolidated into the build.yml workflow.
* The updater checks now use the dist tarball produced by the dist
  tarball build instead of building one for each matrix job.
* The updater and build checks now use a set of jobs for generating
  their test environments.
* The updater and build checks and their shared test environment builds
  now use a unified build matrix, handled in an external data file
  (.github/data/build-matrix.json).
* Nightly artifact uploads and release creation are now dependent on the
  updater checks passing.

* Properly handle generated build matrix.

* Minor fixes.

* Fix shellcheck complaints.

* Fixed stub script handling.

* Mangle the build matrix JSON properly.

* Properly handle stub scripts.

* Fix distro name handling.

* Fix typos.

* Fix test environment image handling.

* Fix updater checks.

* Skip CentOS 7 JSON-C bundling check.

* Fix handling of artifacts for updater check.

* Fix yamllint errors.

* Fix dist tarball handling.

* Fix updater check script permissions.

* Restructure build test Dockerfile for better caching.

* Remove parallelization limits for test environment builds.

These complete fast enough that it is perfectly reasonable to run them
all in parallel simultaneously. In the best case scenario, this will
save roughly 5-10 minutes of time during CI runs.

* Add more in-line documentation and tidy up a few unneeded parameters.

* Add checks to verify consolidated artifacts are good.

* Fix distfile name handling.

* Fix artifact checking.

* Better delineate phases of updater check in logs.

* Simplify updater checks.

* Print checksums of artifacts.

To simplify debugging.

* Fix handling of updater checks.

1 files changed, 109 insertions, 0 deletions

diff --git a/.github/data/build-matrix.json b/.github/data/build-matrix.json
new file mode 100644
index 0000000000..427819b250
--- /dev/null
+++ b/.github/data/build-matrix.json
@@ -0,0 +1,109 @@
+{
+  "include": [
+    {
+      "distro": "alpine:edge",
+      "artifact_key": "alpine-edge",
+      "pre": "apk add -U bash",
+      "rmjsonc": "apk del json-c-dev"
+    },
+    {
+      "distro": "alpine:3.14",
+      "artifact_key": "alpine-3.14",
+      "pre": "apk add -U bash",
+      "rmjsonc": "apk del json-c-dev"
+    },
+    {
+      "distro": "alpine:3.13",
+      "artifact_key": "alpine-3.13",
+      "pre": "apk add -U bash",
+      "rmjsonc": "apk del json-c-dev"
+    },
+    {
+      "distro": "alpine:3.12",
+      "artifact_key": "alpine-3.12",
+      "pre": "apk add -U bash",
+      "rmjsonc": "apk del json-c-dev"
+    },
+    {
+      "distro": "archlinux:latest",
+      "artifact_key": "archlinux",
+      "pre": "pacman --noconfirm -Syu && pacman --noconfirm -Sy grep libffi"
+    },
+    {
+      "distro": "centos:7",
+      "artifact_key": "centos7"
+    },
+    {
+      "distro": "centos:8",
+      "artifact_key": "centos8",
+      "rmjsonc": "dnf remove -y json-c-devel"
+    },
+    {
+      "distro": "debian:11",
+      "artifact_key": "debian11",
+      "pre": "apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    },
+    {
+      "distro": "debian:10",
+      "artifact_key": "debian10",
+      "pre": "apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    },
+    {
+      "distro": "debian:9",
+      "artifact_key": "debian9",
+      "pre": "apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    },
+    {
+      "distro": "fedora:35",
+      "artifact_key": "fedora35",
+      "rmjsonc": "dnf remove -y json-c-devel"
+    },
+    {
+      "distro": "fedora:34",
+      "artifact_key": "fedora34",
+      "rmjsonc": "dnf remove -y json-c-devel"
+    },
+    {
+      "distro": "fedora:33",
+      "artifact_key": "fedora33",
+      "rmjsonc": "dnf remove -y json-c-devel"
+    },
+    {
+      "distro": "opensuse/leap:15.3",
+      "artifact_key": "opensuse15.3",
+      "rmjsonc": "zypper rm -y libjson-c-devel"
+    },
+    {
+      "distro": "opensuse/leap:15.2",
+      "artifact_key": "opensuse15.2",
+      "rmjsonc": "zypper rm -y libjson-c-devel"
+    },
+    {
+      "distro": "ubuntu:21.10",
+      "artifact_key": "ubuntu21.10",
+      "pre": "rm -f /etc/apt/apt.conf.d/docker && apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    },
+    {
+      "distro": "ubuntu:21.04",
+      "artifact_key": "ubuntu21.04",
+      "pre": "apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    },
+    {
+      "distro": "ubuntu:20.04",
+      "artifact_key": "ubuntu20.04",
+      "pre": "apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    },
+    {
+      "distro": "ubuntu:18.04",
+      "artifact_key": "ubuntu18.04",
+      "pre": "apt-get update",
+      "rmjsonc": "apt-get remove -y libjson-c-dev"
+    }
+  ]
+}