Improve CI

* Build tinyconfig kernels instead of "vanilla" ones for speed
* Have one job build both times instead of duplicating into a second job
* Use diffoscope on the .changes file but ignore the buildinfo file

.github/workflows/ci.yml

@@ -3,8 +3,18 @@ name: CI
 on: [push, pull_request]
 
 jobs:
-  vanilla:
+  build:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        target:
+          - tiny-5.15
+          - tiny-6.6
+        # Build twice for comparison
+        build:
+          - one
+          - two
     outputs:
       artifact_id: ${{ steps.upload.outputs.artifact-id }}
     steps:
@@ -14,57 +24,36 @@ jobs:
       - name: Install dependencies
         run: sudo apt-get update && sudo apt-get install -y make build-essential
 
-      - name: Build vanilla kernel
-        run: make vanilla
+      - name: Build tiny kernel
+        run: make ${{ matrix.target }}
 
       - uses: actions/upload-artifact@v4
         id: upload
         with:
-          name: build1
-          path: build
-          if-no-files-found: error
-
-  vanilla2:
-    runs-on: ubuntu-latest
-    outputs:
-      artifact_id: ${{ steps.upload.outputs.artifact-id }}
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Install dependencies
-        run: sudo apt-get update && sudo apt-get install -y make build-essential
-
-      - name: Build vanilla kernel
-        run: make vanilla
-
-      - uses: actions/upload-artifact@v4
-        id: upload
-        with:
-          name: build2
+          name: ${{ matrix.target }}-${{ matrix.build }}
           path: build
           if-no-files-found: error
 
   reproducible:
     runs-on: ubuntu-latest
     container: debian:bookworm
     needs:
-      - vanilla
-      - vanilla2
+      - build
+    strategy:
+      fail-fast: false
+      matrix:
+        target:
+          - tiny-5.15
+          - tiny-6.6
     steps:
       - name: Install dependencies
         run: |
           apt-get update && apt-get install --yes diffoscope-minimal python3-debian \
             --no-install-recommends
       - uses: actions/download-artifact@v4
         with:
-          pattern: "*"
+          pattern: "${{ matrix.target }}*"
       - name: diffoscope
         run: |
-          find . -name '*.deb' -exec sha256sum {} \;
-          # TODO: Ideally we'd just be able to diff the .changes files and let diffoscope find
-          # all the individual debs, but the source packages are not identical. When they are,
-          for deb in `find build1/ -name '*.deb' -exec basename {} \;`; do
-            echo "Diffoscoping $deb"
-            diffoscope build1/$deb build2/$deb
-          done;
+          # We need to exclude .buildinfo because the `Build-Date` will be different
+          diffoscope ${{ matrix.target }}-one/*.changes ${{ matrix.target }}-two/*.changes --exclude '*.buildinfo'