Added docker support

Dockerfile

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+FROM --platform=$BUILDPLATFORM golang:1.26-alpine AS builder
+
+RUN apk add --no-cache git
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+ARG TARGETOS
+ARG TARGETARCH
+
+RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH \
+    go build -ldflags "-s -w" -o MiauInv .
+
+FROM scratch
+COPY --from=builder /app/MiauInv /MiauInv
+ENTRYPOINT ["/MiauInv"]

docker-compose.yaml

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+services:
+  shap-planner:
+    image: git.miaurizius.de/miaurizius/miauinv:latest
+    container_name: MiauInv
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    environment:
+      - JWT_SECRET=SECURE_RANDOM_STRING # Must be at least 32 characters long
+    volumes:
+      - ./appdata:/appdata # To edit your configuration files