mkosi: Add openSUSE params file

The setup is meant to run against openSUSE Tumbleweed and install
minimum packages necessary for successful build and passing tests.

To speed up incremental build an external build directory is used.

.mkosi/mkosi.opensuse

@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
+# This is a settings file for OS image generation using mkosi (https://github.com/systemd/mkosi).
+# Simply invoke "mkosi" in the project directory to build an OS image.
+
+[Distribution]
+Distribution=opensuse
+Release=tumbleweed
+
+[Output]
+Format=raw_btrfs
+Bootable=yes
+
+[Partitions]
+RootSize=3G
+
+[Packages]
+# Uncomment to share system RPM cache (works only with Tumbleweed)
+#Cache=/var/cache/zypp/packages
+BuildDirectory=mkosi.builddir
+BuildPackages=
+        docbook-xsl-stylesheets
+        fdupes
+        gcc
+        gnu-efi
+        gperf
+        intltool
+        libacl-devel
+        libapparmor-devel
+        libblkid-devel
+        libbz2-devel
+        libcap-devel
+        libcryptsetup-devel
+        libcurl-devel
+        libgcrypt-devel
+        libkmod-devel
+        liblz4-devel
+        libmicrohttpd-devel
+        libmount-devel
+        libseccomp-devel
+        libselinux-devel
+        libxslt-tools
+        m4
+        meson
+        pam-devel
+        pciutils-devel
+        pcre-devel
+        python3
+        python3-lxml
+        qrencode-devel
+        zlib-devel
+# to satisfy tests
+        acl
+        glibc-locale
+        system-group-obsolete
+        timezone
+
+Packages=
+        # brought in via meson->python3
+        libp11-kit0