.github: run itests against all types of account stores

In this commit, we ensure that our CI runs our itests against all
available DB backends. Currently, this will only affect the accounts
store.

.github/workflows/main.yml

@@ -275,6 +275,17 @@ jobs:
   itest:
     name: integration test
     runs-on: ubuntu-latest
+    strategy:
+      # Allow other tests in the matrix to continue if one fails.
+      fail-fast: false
+      matrix:
+        include:
+          - name: bbolt
+            args: dbbackend=bbolt
+          - name: sqlite
+            args: dbbackend=sqlite
+          - name: postgres
+            args: dbbackend=postgres
     steps:
       - name: git checkout
         uses: actions/checkout@v4
@@ -295,8 +306,8 @@ jobs:
         working-directory: ./app
         run: yarn
 
-      - name: run check
-        run: make itest
+      - name: run itest ${{ matrix.name }}
+        run: make itest ${{ matrix.args }}
 
       - name: Zip log files on failure
         if: ${{ failure() }}