Enable static builds in CI

.ci/scripts/build-target

@@ -2,8 +2,7 @@
 
 # e - non-interactive terminals will exit on failures immediately
 # x - print commands before exiting
-# u - error on unset variables
-set -exu
+set -ex
 
 PACKAGE_NAME="${PACKAGE_NAME:-$(cat PACKAGE_NAME)}"
 
@@ -12,7 +11,7 @@ cmake -Bbuild -H. -DCMAKE_INSTALL_PREFIX="$PREFIX" \
   -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
   -DCPACK_GENERATOR=TGZ \
   -DCPACK_PACKAGE_FILE_NAME="$PACKAGE_NAME" \
-  -DCPACK_SET_DESTDIR=ON "${CONFIGURE_FLAGS:-}" -G Ninja
+  -DCPACK_SET_DESTDIR=ON $CONFIGURE_FLAGS -G Ninja
 
 # execute specific cmake target
 cmake --build build --target "$TARGET"

.cirrus.yml

@@ -52,8 +52,12 @@ debian_task:
     CXX: g++-8
     matrix:
       - BUILD_TYPE: Release
+      - BUILD_TYPE: Release
+        CONFIGURE_FLAGS: -DBUILD_SHARED_LIBS:BOOL=OFF
       - BUILD_TYPE: Debug
         CONFIGURE_FLAGS: -DENABLE_ADDRESS_SANITIZER:BOOL=ON
+      - BUILD_TYPE: Debug
+        CONFIGURE_FLAGS: -DENABLE_ADDRESS_SANITIZER:BOOL=ON -DBUILD_SHARED_LIBS:BOOL=OFF
   <<: *build_definition
 
 freebsd_task: