BE: Fix vunerabilities in ECS container for geoweb-backend

Following the list of vulnerabilities for geoweb-backend got from CPT:
```
Repository	     Image Tag	Vulnerability	Severity Package Name Version	More Info
knmi/geoweb-backend	1.0.34	CVE-2021-33574	HIGH	glibc	2.28-10	        more info

knmi/geoweb-backend	1.0.34	CVE-2019-25013	HIGH	glibc	2.28-10	        more info

knmi/geoweb-backend	1.0.34	CVE-2020-36329	HIGH	libwebp	0.6.1-2	        more info

knmi/geoweb-backend	1.0.34	CVE-2018-25014	HIGH	libwebp	0.6.1-2	        more info

knmi/geoweb-backend	1.0.34	CVE-2018-25011	HIGH	libwebp	0.6.1-2	        more info

knmi/geoweb-backend	1.0.34	CVE-2020-36328	HIGH	libwebp	0.6.1-2	        more info

knmi/geoweb-backend	1.0.34	CVE-2021-31535	HIGH	libx11	2:1.6.7-1+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3517	HIGH	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3520	HIGH	lz4	1.8.3-1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-22924	MEDIUM	curl	7.64.0-4+deb10u2	more info

knmi/geoweb-backend	1.0.34	CVE-2021-22946	MEDIUM	curl	7.64.0-4+deb10u2	more info

knmi/geoweb-backend	1.0.34	CVE-2021-22947	MEDIUM	curl	7.64.0-4+deb10u2	more info

knmi/geoweb-backend	1.0.34	CVE-2018-12886	MEDIUM	gcc-8	8.3.0-6	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3326	MEDIUM	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2021-35942	MEDIUM	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2020-1751	MEDIUM	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2021-43618	MEDIUM	gmp	2:6.1.2+dfsg-4	more info

knmi/geoweb-backend	1.0.34	CVE-2020-21913	MEDIUM	icu	63.1-6+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-37750	MEDIUM	krb5	1.17-3+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2019-12904	MEDIUM	libgcrypt20	1.8.4-5	more info

knmi/geoweb-backend	1.0.34	CVE-2021-33560	MEDIUM	libgcrypt20	1.8.4-5	more info

knmi/geoweb-backend	1.0.34	CVE-2021-40812	MEDIUM	libgd2	2.2.5-5.2	more info

knmi/geoweb-backend	1.0.34	CVE-2017-6363	MEDIUM	libgd2	2.2.5-5.2	more info

knmi/geoweb-backend	1.0.34	CVE-2021-38115	MEDIUM	libgd2	2.2.5-5.2	more info

knmi/geoweb-backend	1.0.34	CVE-2021-40145	MEDIUM	libgd2	2.2.5-5.2	more info

knmi/geoweb-backend	1.0.34	CVE-2019-12290	MEDIUM	libidn2	2.0.5-1+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2019-13115	MEDIUM	libssh2	1.8.0-2.1	more info

knmi/geoweb-backend	1.0.34	CVE-2018-25013	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2018-25010	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2018-25012	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2020-36332	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2018-25009	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2020-36331	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2020-36330	MEDIUM	libwebp	0.6.1-2	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3537	MEDIUM	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3516	MEDIUM	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3518	MEDIUM	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2016-9318	MEDIUM	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3541	MEDIUM	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2017-16932	MEDIUM	libxml2	2.9.4+dfsg1-7+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3580	MEDIUM	nettle	3.4.1-1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-20305	MEDIUM	nettle	3.4.1-1	more info

knmi/geoweb-backend	1.0.34	CVE-2020-11080	MEDIUM	nghttp2	1.36.0-2+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2020-36309	MEDIUM	nginx	1.19.10-1~buster	more info

knmi/geoweb-backend	1.0.34	CVE-2021-3712	MEDIUM	openssl	1.1.1d-0+deb10u6	more info

knmi/geoweb-backend	1.0.34	CVE-2020-14155	MEDIUM	pcre3	2:8.39-12	more info

knmi/geoweb-backend	1.0.34	CVE-2019-3843	MEDIUM	systemd	241-7~deb10u7	more info

knmi/geoweb-backend	1.0.34	CVE-2019-3844	MEDIUM	systemd	241-7~deb10u7	more info

knmi/geoweb-backend	1.0.34	CVE-2021-33910	MEDIUM	systemd	241-7~deb10u7	more info

knmi/geoweb-backend	1.0.34	CVE-2016-2781	LOW	coreutils	8.30-3	more info

knmi/geoweb-backend	1.0.34	CVE-2021-22898	LOW	curl	7.64.0-4+deb10u2	more info

knmi/geoweb-backend	1.0.34	CVE-2019-15847	LOW	gcc-8	8.3.0-6	more info

knmi/geoweb-backend	1.0.34	CVE-2016-10228	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2020-27618	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2019-19126	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2020-6096	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2020-10029	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2020-1752	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2021-27645	LOW	glibc	2.28-10	more info

knmi/geoweb-backend	1.0.34	CVE-2019-14855	LOW	gnupg2	2.2.12-1+deb10u1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-40528	LOW	libgcrypt20	1.8.4-5	more info

knmi/geoweb-backend	1.0.34	CVE-2019-13627	LOW	libgcrypt20	1.8.4-5	more info

knmi/geoweb-backend	1.0.34	CVE-2018-14553	LOW	libgd2	2.2.5-5.2	more info

knmi/geoweb-backend	1.0.34	CVE-2021-36085	LOW	libsepol	2.8-1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-36086	LOW	libsepol	2.8-1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-36084	LOW	libsepol	2.8-1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-36087	LOW	libsepol	2.8-1	more info

knmi/geoweb-backend	1.0.34	CVE-2019-17498	LOW	libssh2	1.8.0-2.1	more info

knmi/geoweb-backend	1.0.34	CVE-2019-17543	LOW	lz4	1.8.3-1	more info

knmi/geoweb-backend	1.0.34	CVE-2013-0337	LOW	nginx	1.19.10-1~buster	more info

knmi/geoweb-backend	1.0.34	CVE-2018-7169	LOW	shadow	1:4.5-1.1	more info

knmi/geoweb-backend	1.0.34	CVE-2021-37600	LOW	util-linux	2.33.1-0.1	more info
```

**Suggestion from CPT:**

In general we should try to keep the images free of "high" warnings. but we can accept a few medium/low warnings. 
As a general rule it works best to keep the image as small as possible by removing not used packages. (like if there are kernel headers also to remove them as that was if I recall also once the issue.) But in some cases there is no fix and then we have to hope for a future fix.

Story points: 5.0