Add containerfile for running backup image

Containerfile

@@ -0,0 +1,18 @@
+FROM fedora:37
+
+ARG borg_version=1.2.3
+
+RUN dnf install procps-ng borgbackup-$borg_version --assumeyes && \
+  useradd --uid 1000 borg && \
+  mkdir --parents /backups && \
+  dnf clean all --assumeyes
+
+VOLUME /backups
+
+WORKDIR /backups
+
+HEALTHCHECK CMD pgrep --exact borg
+
+USER 1000:1000
+
+CMD ["/bin/bash", "borg"]