rewrite CI scripts in Zig

Merge pull request #20652 from pavelverigo/stage2-wasm-finishAir

ci: update aarch64-macos for a persistent work dir

format: do not force user to provide an alignment field when it's not necessary (#19049)

Merge pull request #20474 from Rexicon226/riscv

build.zig: expose valgrind flag

Merge pull request #20653 from mlugg/incremental-fix

- Added special handling for translating C extern variables declared within scoped blocks

Merge pull request #20632 from jacobly0/codegen-thread

Sema: fix bad merge

std.Zir: some declaration traversal fixes

Merge pull request #20637 from mlugg/comptime-resolution-strat

Merge pull request #20646 from ziglang/fix-updateZirRefs

Sema: add error note for failed coercions to optional types and error unions

Allocate enough memory when building zig2

Merge pull request #20640 from BratishkaErik/std.c/setlocale-fix

Sema: support pointer subtraction

Better implementation of GetLastError. (#20623)

add a missing comment in build.zig.zon

std.os.linux: export getauxval only when building executable or root has main function

start: refactor callMain return type checking

Merge pull request #20622 from squeek502/windows-arg-iterator-cleanup

Tokenizer bug fixes and improvements

Merge pull request #20633 from ziglang/long-live-zig

Sema: disallow casting to opaque

Merge pull request #20593 from jacobly0/more-races

std.crypto.ff: fix typo in `montgomery` boolean documentation (#20624)

Merge pull request #20620 from kcbanner/fixup_msvc_bootstrap

Fix handling of `--save-exact=name` in fetch

std.ArrayList.unusedCapacitySlice: Return unaligned slice (#20490)

std.fmt.formatFloat: skip f80 round-trip tests on x86_64 windows

std.fmt.parseFloat: add f80 formatFloat support

ArgIteratorWindows: Reduce allocated memory by parsing the WTF-16 string directly

zcu: fixup incorrect pass-by-value of Zcu

frontend: report correct paths for C objects

Builder: fix llvm ir syntax

Args including and after `--` get passed to build runner directly

Merge pull request #20580 from ziglang/watch

std.Build.Step.Run: support prefixed artifact args

std: Add loongarch support for coff. (#20583)

Fix right shift on negative BigInts

Zcu: allow atomic operations on packed structs

tls.Client: fix out of bounds panic

Merge pull request #20570 from jacobly0/fix-races

Update `__chkstk_ms` to have weak linkage (#20138)

dwarf: use StackIterator.MemoryAccessor to check memory accesses instead of isValidMemory

Merge pull request #20551 from mochalins/std_thread_pool_fix

fix: Use `std.os.windows.poll` rather than `libc`

std.Progress: slightly better atomic memcpy

Merge pull request #20561 from jacobly0/debug-segfaults

InternPool: implement thread-safe allocated lists

std: fix typos (#20560)

bpf: sync map/prog/attach type with latest linux kernel

Progress: suppress tsan races

std.fs.Dir: Rename OpenDirOptions to OpenOptions (#20542)

crypto.Certificate: case insensitive host name check

Autodoc: only group structs under "namespaces"

build_runner: fix oob access

Merge pull request #20526 from der-teufel-programming/fix-comp-errs

Merge pull request #20528 from jacobly0/tsip

std.crypto.pwhash: Add recommended parameters (#20527)

cmake/findllvm: fix incorrect lib dir setup for zig2

build system: add docs to LinkSystemLibraryOptions

std.c: Add setlocale()

std.Target: Use arch8 as the baseline CPU model for s390x.

Merge pull request #20487 from ziglang/incremental-serialization

Merge pull request #20494 from mlugg/the-great-decl-split

Merge pull request #20496 from ziglang/macos-tsan

build: fix WriteFile and addCSourceFiles not adding LazyPath deps

Add behavior test: including the sentinel when dereferencing a string literal

Merge pull request #19615 from ianic/tar_diagnostic

LLVM Builder: Pass correct argument to ensureUnusedMetadataCapacity

Compilation: pass libc include directories when compiling assembly_with_cpp

json: respect duplicate_field_behavior in std.json.Value.jsonParse

Rename nonSIMDCall* to nonSimdCall*

Rename MAX_NAME_BYTES to max_name_bytes

Add two new io_uring flags to linux.zig

[std.c] Add eventfd and dup3 functions to FreeBSD

glibc headers: arc4random* functions added in glibc 2.36

Make 0e.0 and 0xp0 not crash

Merge pull request #20438 from pavelverigo/stage2-wasm-default-signextend

Rename isASCII to isAscii

add `ppc64` reloc definitions

CI: update macOS runner to 12

Merge pull request #19267 from PanSashko/compile-dup-mod

DynLib: fix a typo in DynLib.openZ

langref: correct test runner path

Merge pull request #20428 from ziglang/macho-tsan

Merge pull request #20424 from mlugg/the-great-decl-split

stage2-wasm: abs 128 bit

std.mem.zeroes: explicit compile error for @Type(.EnumLiteral)

std.zig.target: Remove armeb-windows-gnu and aarch64_be-windows-gnu.

riscv: remove deprecated `Module` usages

std.crypto.chacha: fix typo in XChaChaIETF.stream() (#20399)

std: Extended type checks for Thread startFn return type

std.meta.hasUniqueRepresentation: Handle optional pointers correctly (#20366)

Rename *[UI]LEB128 functions to *[UI]leb128

rename src/Module.zig to src/Zcu.zig

stage2-wasm: fix div and rem

std.Build.findProgram(): Try with and without the Windows executable extensions.