chore(lib): simplify dependency handling

Dockerfile

@@ -1,27 +1,17 @@
 FROM data.forgejo.org/oci/node:22-trixie
 
-ENV PATH=$PATH:/setup-forgejo
 ENV _CONTAINERS_USERNS_CONFIGURED=""
 
 RUN apt-get update && \
-    apt-get --assume-yes --no-install-recommends install \
-        aardvark-dns \
+    apt-get -y -qq --no-install-recommends install \
         ca-certificates \
-        curl \
-        daemon \
         fuse-overlayfs \
         gettext \
-        git \
-        jq \
         libcap2-bin \
         neovim \
         nftables \
         passt \
-        podman \
-        podman-compose \
-        podman-docker \
         procps \
-        pup \
         slirp4netns \
         sudo \
         tcpdump \
@@ -39,9 +29,10 @@ RUN apt-get update && \
     apt-get autoremove --purge && \
     apt-get autoclean
 
-COPY --chown=1001:1001 . /e2e
+COPY lib/dependencies.sh /usr/local/lib
+RUN bash -c "source /usr/local/lib/dependencies.sh; dependencies"
 
-RUN git clone https://code.forgejo.org/actions/setup-forgejo.git /setup-forgejo
+COPY --chown=1001:1001 . /e2e
 
 USER forgejo-tests