Allow for hosting multiple recent dev builds

In case an overzealous change breaks something, people won't have to use an ancient stable version while they wait for me to fix things.

[skip ci]

.github/workflows/build.yml

@@ -156,13 +156,47 @@ jobs:
       with:
         name: zip
 
+    - name: Rename current release
+      if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+      shell: pwsh
+      run: |
+        $oldName = Get-Item -Path '*.zip'
+        $newName = $oldName.Name -replace '(.*?)-(.*)', '$1-dev-newest-$2'
+        Rename-Item -Path $oldName -NewName $newName
+
+    - name: Download old releases
+      if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+      shell: pwsh
+      run: gh release download latest --dir old_releases
+
+    - name: Prep old releases
+      if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+      shell: pwsh
+      working-directory: old_releases
+      run: |
+        Remove-Item -Path *oldest*
+        if (Test-Path *older*)
+        {
+          $oldName = Get-Item -Path *older*
+          $newName = $oldName.Name -replace 'older', 'oldest'
+          Rename-Item -Path $oldName -NewName $newName
+        }
+        if (Test-Path *newest*)
+        {
+          $oldName = Get-Item -Path *newest*
+          $newName = $oldName.Name -replace 'newest', 'older'
+          Rename-Item -Path $oldName -NewName $newName
+        }
+        Move-Item -Path *.zip -Destination ..
+
     - name: Release latest dev build
       if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
       uses: crowbarmaster/[email protected]
       with:
         repo_token: "${{ secrets.GITHUB_TOKEN }}"
         automatic_release_tag: 'latest'
         title: 'Latest dev build'
+        body: "This rolling window release offers the 3 most recent development builds of SHME. Try 'newest' first, then 'older' or 'oldest' if something's broken. Have fun!"
         prerelease: false
         generate_notes: true
         files: |