Refactor binary-compatible-builds for releases (#4171)

* Refactor binary-compatible-builds for releases

I was poking around this yesterday and noticed a few things that could
be improved for our release builds:

* The centos container for the x86_64 builds contained a bunch of extra
  tooling we no longer need such as python3 and a C++ compiler. Along
  with custom toolchain things this could all get removed since the C we
  include now is quite simple.

* The aarch64 and s390x cross-compiled builds had relatively high glibc
  version requirements compared to the x86_64 build. This was because we
  don't use a container to build the cross-compiled binaries. I added
  containers here along the lines of the x86_64 build to use an older
  glibc to build the release binary to lower our version requirement.
  This lower the aarch64 version requirement from glibc 2.28 to 2.17.
  Additionally the s390x requirement dropped from 2.28 to 2.16.

* To make the containers a bit easier to read/write I added
  `Dockerfile`s for them in a new `ci/docker` directory instead of
  hardcoding install commands in JS.

This isn't intended to be a really big change or anything for anyone,
but it's intended to keep our Linux-based builds consistent at least as
best we can.

* Remove temporary change

.github/actions/binary-compatible-builds/action.yml

@@ -4,3 +4,7 @@ description: 'Set up a CentOS 6 container to build releases in'
 runs:
   using: node12
   main: 'main.js'
+inputs:
+  name:
+    required: true
+    description: "Name of the build"

.github/actions/binary-compatible-builds/main.js

@@ -12,14 +12,12 @@ function set_env(name, val) {
 // possible. For now 10.9 is the limit.
 if (process.platform == 'darwin') {
   set_env("MACOSX_DEPLOYMENT_TARGET", "10.9");
-  set_env("python", "python3");
   return;
 }
 
 // On Windows we build against the static CRT to reduce dll dependencies
 if (process.platform == 'win32') {
   set_env("RUSTFLAGS", "-Ctarget-feature=+crt-static");
-  set_env("python", "python");
   return;
 }
 
@@ -28,7 +26,7 @@ if (process.platform == 'win32') {
 // commands in there with the `$CENTOS` env var.
 
 if (process.env.CENTOS !== undefined) {
-  const args = ['exec', '-w', process.cwd(), '-i', 'centos'];
+  const args = ['exec', '-w', process.cwd(), '-i', 'build-container'];
   for (const arg of process.argv.slice(2)) {
     args.push(arg);
   }
@@ -36,40 +34,23 @@ if (process.env.CENTOS !== undefined) {
   return;
 }
 
-// Add our rust mount onto PATH, but also add some stuff to PATH from
-// the packages that we install.
-let path = process.env.PATH;
-path = `${path}:/rust/bin`;
-path = `/opt/rh/devtoolset-8/root/usr/bin:${path}`;
+const name = process.env.INPUT_NAME;
+
+child_process.execFileSync('docker', [
+  'build',
+  '--tag', 'build-image',
+  `${process.cwd()}/ci/docker/${name}`
+], stdio);
 
-// Spawn a container daemonized in the background which we'll connect to via
-// `docker exec`. This'll have access to the current directory.
 child_process.execFileSync('docker', [
   'run',
-  '-di',
-  '--name', 'centos',
+  '--detach',
+  '--interactive',
+  '--name', 'build-container',
   '-v', `${process.cwd()}:${process.cwd()}`,
   '-v', `${child_process.execSync('rustc --print sysroot').toString().trim()}:/rust:ro`,
-  '--env', `PATH=${path}`,
-  // FIXME(rust-lang/rust#80703) this shouldn't be necessary
-  '--env', `LD_LIBRARY_PATH=/rust/lib`,
-  'centos:7',
+  'build-image',
 ], stdio);
 
 // Use ourselves to run future commands
 set_env("CENTOS", __filename);
-
-// See https://edwards.sdsu.edu/research/c11-on-centos-6/ for where these
-const exec = s => {
-  child_process.execSync(`docker exec centos ${s}`, stdio);
-};
-exec('yum install -y centos-release-scl cmake xz epel-release');
-exec('yum install -y python3 patchelf unzip');
-exec('yum install -y devtoolset-8-gcc devtoolset-8-binutils devtoolset-8-gcc-c++');
-exec('yum install -y git');
-
-// Delete `libstdc++.so` to force gcc to link against `libstdc++.a` instead.
-// This is a hack and not the right way to do this, but it ends up doing the
-// right thing for now.
-exec('rm -f /opt/rh/devtoolset-8/root/usr/lib/gcc/x86_64-redhat-linux/8/libstdc++.so');
-set_env("python", "python3");