Revert "docker: Reintroduce cross-platform builds"

This reverts commit 85db664756.

.github/workflows/main-docker.yml

@@ -67,14 +67,6 @@ 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
@@ -115,7 +107,6 @@ jobs:
             id: ghcr-push
             with:
               context: .
-              platforms: ${{ matrix.platform }}
               push: true
               tags: ${{ steps.ghcr-meta.outputs.tags }}
               labels: ${{ steps.ghcr-meta.outputs.labels }}
@@ -138,7 +129,6 @@ jobs:
             id: dh-push
             with:
               context: .
-              platforms: ${{ matrix.platform }}
               push: true
               tags: ${{ steps.dh-meta.outputs.tags }}
               labels: ${{ steps.dh-meta.outputs.labels }}