ci: Test Dangerzone in Ubuntu Noble on CircleCI

Extend our CircleCI jobs to run CI tests in Ubuntu Noble.

This commit also adds support for building the Dangerzone .deb package
in Ubuntu Noble, but does not actually enable it. The reason is that
stdeb, which produces our Debian packages, does not work with Python
3.12, which ships with Ubuntu Noble

Refs #773

.circleci/config.yml

@@ -165,6 +165,33 @@ jobs:
           command: |
             poetry run make test
 
+  ci-ubuntu-noble:
+    machine:
+      image: ubuntu-2004:202111-01
+    steps:
+      - checkout
+      - run: *install-podman
+
+      - run:
+          name: Prepare cache directory
+          command: |
+            sudo mkdir -p /caches
+            sudo chown -R $USER:$USER /caches
+      - run: *calculate-cache-key
+      - restore_cache: *restore-cache
+      - run: *copy-image
+
+      - run:
+          name: Prepare Dangerzone environment
+          command: |
+            ./dev_scripts/env.py --distro ubuntu --version 24.04 build-dev
+
+      - run:
+          name: Run CI tests
+          command: |
+            ./dev_scripts/env.py --distro ubuntu --version 24.04 run --dev \
+                bash -c 'cd dangerzone; poetry run make test'
+
   ci-ubuntu-mantic:
     machine:
       image: ubuntu-2004:202111-01
@@ -414,6 +441,18 @@ jobs:
             ./dev_scripts/env.py --distro debian --version bullseye run --dev \
                 bash -c 'cd dangerzone; poetry run make test'
 
+  build-ubuntu-noble:
+    docker:
+      - image: ubuntu:24.04
+    resource_class: medium+
+    steps:
+      - run: *install-dependencies-deb
+      - checkout
+      - run: *calculate-cache-key
+      - restore_cache: *restore-cache
+      - run: *copy-image
+      - run: *build-deb
+
   build-ubuntu-mantic:
     docker:
       - image: ubuntu:23.10
@@ -524,6 +563,9 @@ workflows:
       - convert-test-docs:
           requires:
             - build-container-image
+      - ci-ubuntu-noble:
+          requires:
+            - build-container-image
       - ci-ubuntu-mantic:
           requires:
             - build-container-image
@@ -548,6 +590,13 @@ workflows:
       - ci-fedora-38:
           requires:
             - build-container-image
+      # FIXME: Currently disabled because `stdeb` does not work with Python
+      # 3.12, which is the default in Ubuntu Noble. See also:
+      # https://github.com/freedomofpress/dangerzone/issues/773
+      #
+      #- build-ubuntu-noble:
+      #    requires:
+      #      - build-container-image
       - build-ubuntu-mantic:
           requires:
             - build-container-image