Add an extensions API to the collaboration server (#7807)

This PR adds a REST API to the collab server for searching and
downloading extensions. Previously, we had implemented this API in
zed.dev directly, but this implementation is better, because we use the
collab database to store the download counts for extensions.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
Co-authored-by: Marshall <marshall@zed.dev>
Co-authored-by: Conrad <conrad@zed.dev>

.github/workflows/deploy_collab.yml

@@ -45,8 +45,18 @@ jobs:
           submodules: "recursive"
           fetch-depth: 0
 
+      - name: Install cargo nextest
+        shell: bash -euxo pipefail {0}
+        run: |
+          cargo install cargo-nextest
+
+      - name: Limit target directory size
+        shell: bash -euxo pipefail {0}
+        run: script/clear-target-dir-if-larger-than 100
+
       - name: Run tests
-        uses: ./.github/actions/run_tests
+        shell: bash -euxo pipefail {0}
+        run: cargo nextest run --package collab --no-fail-fast
 
   publish:
     name: Publish collab server image
@@ -90,22 +100,26 @@ jobs:
       - name: Sign into Kubernetes
         run: doctl kubernetes cluster kubeconfig save --expiry-seconds 600 ${{ secrets.CLUSTER_NAME }}
 
-      - name: Determine namespace
+      - name: Start rollout
         run: |
           set -eu
           if [[ $GITHUB_REF_NAME = "collab-production" ]]; then
-            echo "Deploying collab:$GITHUB_SHA to production"
-            echo "KUBE_NAMESPACE=production" >> $GITHUB_ENV
+            export ZED_KUBE_NAMESPACE=production
           elif [[ $GITHUB_REF_NAME = "collab-staging" ]]; then
-            echo "Deploying collab:$GITHUB_SHA to staging"
-            echo "KUBE_NAMESPACE=staging" >> $GITHUB_ENV
+            export ZED_KUBE_NAMESPACE=staging
           else
             echo "cowardly refusing to deploy from an unknown branch"
             exit 1
           fi
 
-      - name: Start rollout
-        run: kubectl -n "$KUBE_NAMESPACE" set image deployment/collab collab=registry.digitalocean.com/zed/collab:${GITHUB_SHA}
+          echo "Deploying collab:$GITHUB_SHA to $ZED_KUBE_NAMESPACE"
 
-      - name: Wait for rollout to finish
-        run: kubectl -n "$KUBE_NAMESPACE" rollout status deployment/collab
+          source script/lib/deploy-helpers.sh
+          export_vars_for_environment $ZED_KUBE_NAMESPACE
+
+          export ZED_DO_CERTIFICATE_ID=$(doctl compute certificate list --format ID --no-header)
+          export ZED_IMAGE_ID="registry.digitalocean.com/zed/collab:${GITHUB_SHA}"
+
+          envsubst < crates/collab/k8s/collab.template.yml | kubectl apply -f -
+          kubectl -n "$ZED_KUBE_NAMESPACE" rollout status deployment/collab --watch
+          echo "deployed collab.template.yml to ${ZED_KUBE_NAMESPACE}"