docker: Reintroduce cross-platform builds

Author: eliandoran

.github/workflows/main-docker.yml

@@ -67,6 +67,14 @@ jobs:
         runs-on: ubuntu-latest
         needs:
             - test_docker
+        strategy:
+            fail-fast: true
+            matrix:
+                platform:
+                    - linux/amd64
+                    - linux/arm64
+                    - linux/arm/v7
+                    - linux/arm/v6
         permissions:
           contents: read
           packages: write
@@ -107,6 +115,7 @@ jobs:
             id: ghcr-push
             with:
               context: .
+              platforms: ${{ matrix.platform }}
               push: true
               tags: ${{ steps.ghcr-meta.outputs.tags }}
               labels: ${{ steps.ghcr-meta.outputs.labels }}
@@ -129,6 +138,7 @@ jobs:
             id: dh-push
             with:
               context: .
+              platforms: ${{ matrix.platform }}
               push: true
               tags: ${{ steps.dh-meta.outputs.tags }}
               labels: ${{ steps.dh-meta.outputs.labels }}