CI: Install docker-compose

docker-compose doesn't appear to be included in the github actions
runner images anymore so we need to install it manually.

Ideally we would use the `services` key in github actions workflows but
our tests depend on eventstore using the certificates included in the
repository.

.github/workflows/ci.yml

@@ -17,6 +17,9 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
 
+    - name: Install docker-compose
+      run: sudo apt install docker-compose
+
     - name: Spawn docker-compose EventStoreDB container
       run: docker-compose up --detach eventstore
 

.github/workflows/compatibility.yml

@@ -26,6 +26,9 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
 
+    - name: Install docker-compose
+      run: sudo apt install docker-compose
+
     - name: Set the EventStoreDB version
       run: sed -i 's|ghcr.io/eventstore/eventstore:ci|eventstore/eventstore:${{ matrix.eventstore }}-buster-slim|g' docker-compose.yml