containerized; first fixes; html templates added

Dockerfile

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+# Stage 1: Build the binary
+FROM golang:alpine AS builder
+LABEL maintainer="Alex Stölting <alex-gomembership@gar-nich.net>"
+# Set the Current Working Directory inside the container
+WORKDIR /app
+
+# Copy go mod and sum files
+COPY go.mod go.sum ./
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
+RUN go mod download
+
+# Copy the source code into the container
+COPY . .
+ENV CGO_ENABLED=1
+RUN apk add --no-cache gcc musl-dev
+# Build the Go app
+RUN go build -o main ./cmd/membership
+FROM golang:alpine
+
+# Set the Current Working Directory inside the container
+WORKDIR /root/
+
+# Copy the Pre-built binary file from the builder stage
+COPY --from=builder /app/main .
+
+# Expose port 8080 to the outside world
+EXPOSE 8080
+
+# Command to run the executable
+CMD ["./main"]
+