mkosi/ci: use a bash array to pass options

This patch initially also changed the configuration, but that'll be done in a
different way, so all that remains is the syntax change.
An array is nicer because the array definition can have inline comments and
doesn't use continuation symbols which are easy to mess up in edits.

(cherry picked from commit f5292d63af)

.github/workflows/mkosi.yml

@@ -132,6 +132,7 @@ jobs:
         run: |
           # XXX: drop after the HyperV bug that breaks secure boot KVM guests is solved
           sed -i "s/'firmware'\s*:\s*'auto'/'firmware' : 'uefi'/g" test/*/meson.build
+
           tee mkosi.local.conf <<EOF
           [Distribution]
           Distribution=${{ matrix.distro }}
@@ -186,21 +187,24 @@ jobs:
 
       - name: Configure meson
         run: |
-          meson setup build \
-              --buildtype=debugoptimized \
-              -Dintegration-tests=true \
-              -Dremote=enabled \
-              -Dopenssl=enabled \
-              -Dblkid=enabled \
-              -Dtpm2=enabled \
-              -Dlibcryptsetup=enabled \
-              -Dlibcurl=enabled \
-              -Drepart=enabled \
-              -Dfirstboot=true \
-              -Dsysusers=true \
-              -Dtmpfiles=true \
-              -Dhwdb=true \
+          OPTIONS=(
+              --buildtype=debugoptimized
+              -Dintegration-tests=true
+              -Dremote=enabled
+              -Dopenssl=enabled
+              -Dblkid=enabled
+              -Dtpm2=enabled
+              -Dlibcryptsetup=enabled
+              -Dlibcurl=enabled
+              -Drepart=enabled
+              -Dfirstboot=true
+              -Dsysusers=true
+              -Dtmpfiles=true
+              -Dhwdb=true
               -Dvmspawn=enabled
+          )
+
+          meson setup build "${OPTIONS[@]}"
 
       - name: Build image
         run: sudo meson compile -C build mkosi