fix(image-build): change from emulation to cross-compile (#162)

for building multi-platform images
eclipse-tractusx/portal-backend#802
https://docs.docker.com/build/building/multi-platform
https://devblogs.microsoft.com/dotnet/improving-multiplatform-container-support
also improve dockerfiles by removing unnecessary base stage and aligning environment variables

.github/workflows/migrations-docker.yml

@@ -58,9 +58,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
-
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1

.github/workflows/release.yml

@@ -114,9 +114,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
-
       # Create SemVer or ref tags dependent of trigger event
       - name: Docker meta
         id: meta

.github/workflows/release_candidate.yml

@@ -55,9 +55,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
-
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1

.github/workflows/service-docker.yml

@@ -57,9 +57,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
-
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1

docker/Dockerfile-policy-hub-migrations

@@ -17,16 +17,15 @@
 # SPDX-License-Identifier: Apache-2.0
 ###############################################################
 
-FROM mcr.microsoft.com/dotnet/runtime:8.0-alpine AS base
-
-FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine-amd64 AS publish
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS publish
+ARG TARGETARCH
 WORKDIR /
 COPY LICENSE NOTICE.md DEPENDENCIES /
 COPY /src/database /src/database
 WORKDIR /src/database/PolicyHub.Migrations
 RUN dotnet publish "PolicyHub.Migrations.csproj" -c Release -o /migrations/publish
 
-FROM base AS final
+FROM mcr.microsoft.com/dotnet/runtime:8.0-alpine
 ENV COMPlus_EnableDiagnostics=0
 WORKDIR /migrations
 COPY --from=publish /migrations/publish .

docker/Dockerfile-policy-hub-service

@@ -17,20 +17,20 @@
 # SPDX-License-Identifier: Apache-2.0
 ###############################################################
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine AS base
-
-FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine-amd64 AS publish
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS publish
+ARG TARGETARCH
 WORKDIR /
 COPY LICENSE NOTICE.md DEPENDENCIES /
 COPY src/ src/
 WORKDIR /src/hub/PolicyHub.Service
 RUN dotnet publish "PolicyHub.Service.csproj" -c Release -o /app/publish
 
-FROM base AS final
-ENV COMPlus_EnableDiagnostics=0
+FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine
+ENV \
+    COMPlus_EnableDiagnostics=0 \
+    ASPNETCORE_URLS=http://+:8080
 WORKDIR /app
 COPY --from=publish /app/publish .
-ENV ASPNETCORE_URLS http://+:8080
 EXPOSE 8080
 RUN chown -R 1000:3000 /app
 USER 1000:3000