split docker to use base image for faster builds (#4586)

.github/workflows/docker-base.yaml

@@ -0,0 +1,43 @@
+name: 'Docker Build'
+# act -j build -W ./.github/workflows/docker-base.yaml --secret-file  .dockerhub.secrets
+
+on:
+    workflow_dispatch:
+    schedule:
+      - cron: "0 4 5 * *" # build on the 5th of every month
+
+jobs:
+    build:
+        strategy:
+            matrix:
+                server: [ fpm, apache ]
+        runs-on: ubuntu-latest
+
+        steps:
+
+            - name: Checkout code
+              uses: actions/checkout@v4
+
+            - name: Install buildx
+              uses: docker/setup-buildx-action@v2
+
+            - name: Login to DockerHub
+              uses: docker/login-action@v2
+              with:
+                  username: ${{secrets.DOCKERHUB_USERNAME}}
+                  password: ${{secrets.DOCKERHUB_PASSWORD}}
+
+            - name: Build
+              uses: docker/build-push-action@v4
+              with:
+                  context: .docker
+                  file: .docker/Dockerfile.kimai-base
+                  build-args: |
+                      TIMEZONE=Europe/London
+                      BASE=${{ matrix.server }}
+                  platforms: linux/amd64,linux/arm64 #,linux/arm/v8,linux/arm/v7,linux/arm/v6
+                  tags: |
+                    kimai/kimai-base:${{ matrix.server }}
+                  push: true
+
+