remove custom-release workflow

workflow_dispatch requires read and write access to the repo, which
is not suitable for public usage.

Also restricted pre-release workflow to master branch.

.github/workflows/custom-release.yml

@@ -1,58 +0,0 @@
-name: custom-release
-
-on:
-  workflow_dispatch:
-    inputs:
-      target:
-        type: choice
-        description: Target
-        required: true
-        options:
-          - aarch64-apple-darwin
-          - aarch64-unknown-linux-musl
-          - armv6l-unknown-linux-musleabihf
-          - armv7l-unknown-linux-musleabihf
-          - i686-unknown-linux-musl
-          # FIXME
-          # - i686-w64-mingw32
-          - x86_64-apple-darwin
-          - x86_64-unknown-linux-musl
-          - x86_64-w64-mingw32
-      defaultFeatures:
-        type: boolean
-        description: Enable default cargo features
-        default: true
-      features:
-        type: string
-        description: Cargo features (comma-separated)
-
-jobs:
-  custom-release:
-    runs-on: ${{ inputs.target == 'x86_64-apple-darwin' && 'macos-13' || inputs.target == 'aarch64-apple-darwin' && 'macos-14' || 'ubuntu-latest' }}
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Install Nix
-        uses: cachix/install-nix-action@v27
-        with:
-          # TODO: nix_path: nixpkgs=channel:nixos-unstable
-          nix_path: nixpkgs=https://github.com/soywod/nixpkgs/archive/master.tar.gz
-          enable_kvm: true
-      - name: Cache Nix store
-        uses: cachix/cachix-action@v15
-        with:
-          name: soywod
-          authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-          extraPullNames: nix-community
-      - name: Build custom release
-        run: |
-          nix-build \
-            --arg crossPkgs 'import <nixpkgs> { crossSystem = { config = "${{ inputs.target }}"; isStatic = true; }; }' \
-            --arg fenix 'import (fetchTarball "https://github.com/soywod/fenix/archive/main.tar.gz") { }' \
-            --arg defaultFeatures ${{ inputs.defaultFeatures }} \
-            --argstr features ${{ inputs.features }}
-      - name: Upload custom release
-        uses: actions/upload-artifact@v4
-        with:
-          name: himalaya-${{ inputs.target }}
-          path: result/bin/himalaya*

.github/workflows/pre-release.yml

@@ -1,7 +1,9 @@
 name: pre-release
 
 on:
+  workflow_dispatch:
   push:
+    branch: master
 
 jobs:
   pre-release: