build: manual win32 workflow

.github/workflows/build.yml

@@ -44,20 +44,10 @@ jobs:
                   make compile-linux
                   make test-all
 
-            - name: Install MSYS2 and 'mingw-w64-i686-toolchain'
-              if: matrix.os == 'windows-latest'
-              uses: msys2/setup-msys2@v2
-              with:
-                  cache: true
-                  install: mingw-w64-i686-toolchain
-                  update: true
-
             - name: Build for Windows
               if: matrix.os == 'windows-latest'
               shell: bash
-              run: |
-                  $RUNNER_TEMP/msys64/msys2_shell.cmd -defterm -no-start -mingw32 -lc "mingw32-make compile-windows-x86"
-                  make compile-windows
+              run: make compile-windows
 
             - name: Build for macOS
               if: matrix.os == 'macos-latest'

.github/workflows/win32.yml

@@ -0,0 +1,37 @@
+name: win32
+
+on:
+    workflow_dispatch:
+
+env:
+    SQLITE_RELEASE_YEAR: "2021"
+    SQLITE_VERSION: "3360000"
+    SQLITE_BRANCH: "3.36"
+
+jobs:
+    build:
+        name: Build for 32-bit Windows
+        runs-on: windows-latest
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Download SQLite sources
+              shell: bash
+              run: |
+                  make prepare-dist
+                  make download-sqlite
+                  make download-external
+
+            - name: Install MSYS2 and 'mingw-w64-i686-toolchain'
+              uses: msys2/setup-msys2@v2
+              with:
+                  cache: true
+                  install: mingw-w64-i686-toolchain
+                  update: true
+
+            - name: Build
+              shell: bash
+              run: |
+                  $RUNNER_TEMP/msys64/msys2_shell.cmd -defterm -no-start -mingw32 -lc "mingw32-make compile-windows-x86"
+                  make compile-windows