Added Podman file to easily build podman images.

Podmanfile

@@ -0,0 +1,42 @@
+ARG GO_VERSION=1.16.2
+
+FROM docker.io/golang:${GO_VERSION}-alpine AS builder
+
+RUN apk update && apk add alpine-sdk git && rm -rf /var/cache/apk/*
+
+RUN mkdir -p /api
+WORKDIR /api
+
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+COPY . .
+RUN go build -o ./app ./main.go
+
+FROM alpine:latest
+
+LABEL org.opencontainers.image.source="https://github.com/kucksdorfs/podgrab"
+
+ENV CONFIG=/config
+ENV DATA=/assets
+ENV UID=998
+ENV PID=100
+ENV GIN_MODE=release
+VOLUME ["/config", "/assets"]
+RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/*
+RUN mkdir -p /config; \
+    mkdir -p /assets; \
+    mkdir -p /api
+
+RUN chmod 777 /config; \
+    chmod 777 /assets
+
+WORKDIR /api
+COPY --from=builder /api/app .
+COPY client ./client
+COPY webassets ./webassets
+
+EXPOSE 8080
+
+ENTRYPOINT ["./app"]