ci(goreleaser): automate releases on tag push

This commit adapts a basic GoReleaser configuration to work for Rust
projects, allowing us to automatically create releases on GitHub via
GitHub Actions whenever a semantic version tag (vX.Y.Z) is pushed, with
custom changelogs generated by kokai, and zipped binaries attached to
the release.

Those zipped binaries are then used to create a Scoop release in a
custom bucket.

Due to the way that Scoop uses shims, when running the 'komorebic start'
command, there needs to be an explicit check to try and determine if
komorebi has been installed via Scoop. This is done by checking for a
komorebi.ps1 shim in the Path.

Scoop shims cannot be used with the Start-Process PS command, so
instead, we replicate in code what the komorebi.ps1 script is doing
(finding the path to the current version of the executable), and then
passing the entire path to the Start-Process command that gets called to
start komorebi.

The README has been updated to reflect the availability of prebuilt
binaries and how to get started with them.

.github/workflows/windows.yaml

@@ -1,4 +1,4 @@
-# Adapted from the rustup workflows
+# Adapted from https://github.com/rust-lang/rustup/blob/master/.github/workflows/windows-builds-on-master.yaml
 
 name: Windows
 
@@ -11,15 +11,15 @@ on:
       - master
       - feature/*
       - hotfix/*
+    tags:
+      - v*
   schedule:
-    - cron: "30 0 * * 1" # Every Monday at half past midnight UTC skip-pr skip-stable
+    - cron: "30 0 * * 1" # Every Monday at half past midnight UTC
 
 jobs:
   build:
     name: Build
     runs-on: windows-latest
-    env:
-      RUSTFLAGS: -Ctarget-feature=+crt-static
     strategy:
       fail-fast: false
       matrix:
@@ -27,7 +27,6 @@ jobs:
           - x86_64-pc-windows-msvc
     steps:
       - uses: actions/checkout@v2
-        # v2 defaults to a shallow checkout, but we need at least to the previous tag
         with:
           fetch-depth: 0
       - name: Prep cargo dirs
@@ -35,29 +34,18 @@ jobs:
           New-Item "${env:USERPROFILE}\.cargo\registry" -ItemType Directory -Force
           New-Item "${env:USERPROFILE}\.cargo\git" -ItemType Directory -Force
         shell: powershell
-      - name: Install mingw
-        run: |
-          # We retrieve mingw from the Rust CI buckets
-          # Disable the download progress bar which can cause perf issues
-          $ProgressPreference = "SilentlyContinue"
-          Invoke-WebRequest ${{ matrix.mingw }} -OutFile mingw.7z
-          7z x -y mingw.7z -oC:\msys64 | Out-Null
-          del mingw.7z
-          echo "C:\msys64\usr\bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
-          echo "C:\msys64\${{ matrix.mingwdir }}\bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
-        shell: powershell
-        if: matrix.mingw != ''
       - name: Set environment variables appropriately for the build
         run: |
           echo "%USERPROFILE%\.cargo\bin" | Out-File -Append -FilePath $env:GITHUB_PATH -Encoding utf8
           echo "TARGET=${{ matrix.target }}" | Out-File -Append -FilePath $env:GITHUB_ENV -Encoding utf8
           echo "SKIP_TESTS=" | Out-File -Append -FilePath $env:GITHUB_ENV -Encoding utf8
-      - name: Cache cargo registry and git trees
+      - name: Cache cargo registry, git trees and binaries
         uses: actions/cache@v2
         with:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
+            ~/.cargo/bin
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
       - name: Get rustc commit hash
         id: cargo-target-cache
@@ -95,3 +83,18 @@ jobs:
             target/${{ matrix.target }}/release/komorebi.exe
             target/${{ matrix.target }}/release/komorebic.exe
           retention-days: 7
+      - name: Generate changelog
+        if: startsWith(github.ref, 'refs/tags/')
+        shell: bash
+        run: |
+          if ! type kokai >/dev/null; then cargo install --locked kokai --force; fi
+          kokai release --no-emoji --add-links github:commits,issues --ref "$(git tag --points-at HEAD)" >"CHANGELOG.md"
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          version: latest
+          args: release --skip-validate --rm-dist --release-notes=CHANGELOG.md
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SCOOP_TOKEN: ${{ secrets.SCOOP_TOKEN }}