ci: use ASDF_SOZO_VERSION env var for sozo version

The `asdf set -u` approach writes to `~/.tool-versions`, but asdf stops
searching when it finds a `.tool-versions` in a parent directory (e.g.
in the cloned dojo repo) that doesn't include sozo. The
ASDF_<TOOL>_VERSION env var takes highest precedence in asdf's version
resolution, overriding any `.tool-versions` file.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: kariy

.github/workflows/generate-db-dispatch.yml

@@ -9,6 +9,8 @@ jobs:
         runs-on: ubuntu-latest
         container:
             image: ghcr.io/dojoengine/katana-dev:latest
+        env:
+            ASDF_SOZO_VERSION: "1.7.0"
         steps:
             - uses: actions/checkout@v4
               with:
@@ -29,9 +31,6 @@ jobs:
               with:
                   scarb-version: "2.10.1"
 
-            - name: Set sozo version
-              run: asdf set -u sozo 1.7.0
-
             - name: Generate test database
               run: ./scripts/generate-test-db.sh --dojo-tag v1.6.0
 
@@ -45,6 +44,8 @@ jobs:
         runs-on: ubuntu-latest
         container:
             image: ghcr.io/dojoengine/katana-dev:latest
+        env:
+            ASDF_SOZO_VERSION: "1.7.0"
         steps:
             - uses: actions/checkout@v4
               with:
@@ -54,9 +55,6 @@ jobs:
             - run: git config --global --add safe.directory "*"
             - uses: Swatinem/rust-cache@v2
 
-            - name: Set sozo version
-              run: asdf set -u sozo 1.7.0
-
             - name: Build contracts
               run: make contracts