Add docker install steps

.forgejo/workflows/build.yml

@@ -6,6 +6,18 @@ jobs:
     build-container:
         runs-on: docker
         steps:
+            -
+                name: Prepare Container Environment
+                run: apt-get install ca-certificates curl gnupg
+                run: install -m 0755 -d /etc/apt/keyrings
+                run: curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+                run: chmod a+r /etc/apt/keyrings/docker.gpg
+                run: echo \
+  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
+  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
+  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+                run: apt-get update
+                run: apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
             -
                 name: Set up QEMU
                 uses: docker/setup-qemu-action@v3