Use gh workflow for tests (#41384)

Follow up for: #41304

Splits CI tests (cherry-picks and PRs only for now) into separate
workflows using `gh-workflow`. Includes a couple restructures to
- run more things in parallel
- remove our previous shell script based checking to filter tests based
on files changed, instead using the builtin `paths:` workflow filters


Splitting the docs/style/rust tests & checks into separate workflows
means we lose the complete summary showing all the tests in one view,
but it's possible to re-add in the future if we go back to checking what
files changed ourselves or always run everything.

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Conrad <conrad@zed.dev>

.github/workflows/nix_build.yml

@@ -1,14 +1,31 @@
 # Generated from xtask::workflows::nix_build
 # Rebuild with `cargo xtask workflows`.
 name: nix_build
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: '1'
+  CARGO_INCREMENTAL: '0'
 on:
-  workflow_call:
-    inputs:
-      flake-output:
-        type: string
-        default: default
-      cachix-filter:
-        type: string
+  pull_request:
+    branches:
+    - '**'
+    paths:
+    - nix/**
+    - flake.*
+    - Cargo.*
+    - rust-toolchain.toml
+    - .cargo/config.toml
+  push:
+    branches:
+    - main
+    - v[0-9]+.[0-9]+.x
+    paths:
+    - nix/**
+    - flake.*
+    - Cargo.*
+    - rust-toolchain.toml
+    - .cargo/config.toml
+  workflow_call: {}
 jobs:
   build_nix_linux_x86_64:
     if: github.repository_owner == 'zed-industries'
@@ -33,9 +50,9 @@ jobs:
         name: zed
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
         cachixArgs: -v
-        pushFilter: ${{ inputs.cachix-filter }}
+        pushFilter: -zed-editor-[0-9.]*-nightly
     - name: nix_build::build
-      run: nix build .#${{ inputs.flake-output }} -L --accept-flake-config
+      run: nix build .#debug -L --accept-flake-config
       shell: bash -euxo pipefail {0}
     timeout-minutes: 60
     continue-on-error: true
@@ -63,9 +80,9 @@ jobs:
         name: zed
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
         cachixArgs: -v
-        pushFilter: ${{ inputs.cachix-filter }}
+        pushFilter: -zed-editor-[0-9.]*-nightly
     - name: nix_build::build
-      run: nix build .#${{ inputs.flake-output }} -L --accept-flake-config
+      run: nix build .#debug -L --accept-flake-config
       shell: bash -euxo pipefail {0}
     - name: nix_build::limit_store
       run: |-
@@ -75,3 +92,6 @@ jobs:
       shell: bash -euxo pipefail {0}
     timeout-minutes: 60
     continue-on-error: true
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.ref_name == 'main' && github.sha || 'anysha' }}
+  cancel-in-progress: true