Update Dockerfile, configs, etc

This change updates the Dockerfile and test configs to account for
the switch to cobra command which uses a double dash for the config
flag.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

Author: gabriel-samfira

Dockerfile

@@ -88,4 +88,4 @@ COPY --from=builder /opt/garm/providers.d/garm-provider-k8s /opt/garm/providers.
 COPY --from=builder /opt/garm/providers.d/garm-provider-cloudstack /opt/garm/providers.d/garm-provider-cloudstack
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 
-ENTRYPOINT ["/bin/garm", "-config", "/etc/garm/config.toml"]
+ENTRYPOINT ["/bin/garm", "--config", "/etc/garm/config.toml"]

contrib/garm.service

@@ -4,7 +4,7 @@ After=multi-user.target
 
 [Service]
 Type=simple
-ExecStart=/usr/local/bin/garm -config /etc/garm/config.toml
+ExecStart=/usr/local/bin/garm --config /etc/garm/config.toml
 ExecReload=/bin/kill -HUP $MAINPID
 Restart=always
 RestartSec=5s

test/integration/config/garm.service

@@ -4,7 +4,7 @@ After=multi-user.target
 
 [Service]
 Type=simple
-ExecStart=/usr/local/bin/garm -config ${GARM_CONFIG_FILE}
+ExecStart=/usr/local/bin/garm --config ${GARM_CONFIG_FILE}
 ExecReload=/bin/kill -HUP $MAINPID
 Restart=always
 RestartSec=5s