git-artifacts: stop building i686 artifacts except mingit

As announced multiple times and also documented in detail at
https://gitforwindows.org/32-bit, Git for Windows will no longer
publish 32-bit installers, portable Gits and such.

The only i686 artifacts that will be published are the MinGit ones,
until April 2029.

This addresses git-for-windows/git#5394.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

create-artifacts-matrix.js

@@ -6,28 +6,29 @@ module.exports = (artifactsString, architecture) => {
     }
 
     const validArtifacts = [
-        {
-            name: 'installer',
-            filePrefix: 'Git',
-            fileExtension: 'exe'
-        },
-        {
-            name: 'portable',
-            filePrefix: 'PortableGit',
-            fileExtension: 'exe'
-        },
-        {
-            name: 'archive',
-            filePrefix: 'Git',
-            fileExtension: 'tar.bz2'
-        },
         {
             name: 'mingit',
             filePrefix: 'MinGit',
             fileExtension: 'zip'
         }
     ]
 
+    if (architecture !== 'i686') validArtifacts.unshift({
+        name: 'installer',
+        filePrefix: 'Git',
+        fileExtension: 'exe'
+    },
+    {
+        name: 'portable',
+        filePrefix: 'PortableGit',
+        fileExtension: 'exe'
+    },
+    {
+        name: 'archive',
+        filePrefix: 'Git',
+        fileExtension: 'tar.bz2'
+    })
+
     if (architecture !== 'aarch64') validArtifacts.push({
         name: 'mingit-busybox',
         filePrefix: 'MinGit',