fix: use git init + fetch checkout to handle non-empty workspace

- Replace git clone . with git init + git fetch + git checkout FETCH_HEAD
  Runner pre-creates workspace directory, so git clone . fails
- Use GITHUB_SHA to fetch exact commit, matching original checkout behavior
- Add DOCKER_HOST=tcp://dind:2375 to E2E job step env

.forgejo/workflows/ci.yml

@@ -13,8 +13,10 @@ jobs:
     steps:
       - name: Checkout repository
         run: |
-          git clone --depth 1 \
-            https://x-access-token:${FORGEJO_TOKEN}@srvr.nu/git/jocke/bilhej.git .
+          git init
+          git remote add origin https://x-access-token:${FORGEJO_TOKEN}@srvr.nu/git/jocke/bilhej.git
+          git fetch --depth 1 origin ${GITHUB_SHA}
+          git checkout FETCH_HEAD
 
       - uses: actions/setup-node@v4
         with:
@@ -66,10 +68,14 @@ jobs:
     steps:
       - name: Checkout repository
         run: |
-          git clone --depth 1 \
-            https://x-access-token:${FORGEJO_TOKEN}@srvr.nu/git/jocke/bilhej.git .
+          git init
+          git remote add origin https://x-access-token:${FORGEJO_TOKEN}@srvr.nu/git/jocke/bilhej.git
+          git fetch --depth 1 origin ${GITHUB_SHA}
+          git checkout FETCH_HEAD
 
       - name: Run E2E test stack
+        env:
+          DOCKER_HOST: tcp://dind:2375
         run: |
           docker compose \
             -f docker-compose.ci.yml \