Checkout the repository with git

This changes the build process even further. Instead
f using `wget` to fetch the current code, `git` is used.
This allows for faster switching between branches,
because only the differences between them have to be
fetched from the server.

But the main advantage is that the build cache can
finally be used as designed by Docker. Repetitive
builds are very fast now. This is also true between
branches and tags, as long as the `requirements.txt`
file doesn't change.

Dockerfile

@@ -28,7 +28,8 @@ RUN pip install --install-option="--prefix=/install" \
 # django_auth_ldap is required for ldap
       django_auth_ldap
 
-COPY .netbox/netbox/requirements.txt /
+ARG NETBOX_PATH
+COPY ${NETBOX_PATH}/requirements.txt /
 RUN pip install --install-option="--prefix=/install" -r /requirements.txt 
 
 ###
@@ -53,7 +54,9 @@ RUN apk add --no-cache \
 WORKDIR /opt
 
 COPY --from=builder /install /usr/local
-COPY .netbox/netbox /opt/netbox
+
+ARG NETBOX_PATH
+COPY ${NETBOX_PATH} /opt/netbox
 
 COPY docker/configuration.docker.py /opt/netbox/netbox/netbox/configuration.py
 COPY configuration/gunicorn_config.py /etc/netbox/config/
@@ -69,13 +72,11 @@ ENTRYPOINT [ "/opt/netbox/docker-entrypoint.sh" ]
 
 CMD ["gunicorn", "-c /etc/netbox/config/gunicorn_config.py", "netbox.wsgi"]
 
-LABEL SRC_URL="$URL"
-
-ARG NETBOX_DOCKER_PROJECT_VERSION=snapshot
-LABEL NETBOX_DOCKER_PROJECT_VERSION="$NETBOX_DOCKER_PROJECT_VERSION"
-
-ARG NETBOX_BRANCH=custom_build
-LABEL NETBOX_BRANCH="$NETBOX_BRANCH"
+LABEL NETBOX_DOCKER_PROJECT_VERSION="custom build" \
+      NETBOX_BRANCH="custom build" \
+      ORIGINAL_DOCKER_TAG="custom build" \
+      NETBOX_GIT_COMMIT="not built from git" \
+      NETBOX_GIT_URL="not built from git"
 
 #####
 ## LDAP specific configuration