ci: install gpgme-devel for db test

This prepares the usage of the `internal/container` from composer
directly, as opposed to the existing use in the worker. Said pkg
uses the `containers/image/v5`, which uses `proglottis/gpgme` and
the latter needs the gpgme C library. We therefore install it and
its dependencies.

.github/workflows/tests.yml

@@ -57,6 +57,9 @@ jobs:
         ports:
           - 5432:5432
     steps:
+      # gpgme-devel is needed for container upload dependencies
+    - name: Install test dependencies
+      run: sudo apt-get install -y libgpgme-dev
     - uses: actions/checkout@v2
     - uses: actions/setup-go@v3
       with: