fix(ci): replace git push with Gitea API file update

git push over HTTPS was failing auth despite correct credentials.
Use PUT /contents API instead — same token already works for releases.

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

codemagic.yaml

@@ -64,13 +64,16 @@ workflows:
              altstore-source.json > altstore-source.tmp.json
           mv altstore-source.tmp.json altstore-source.json
 
-          # Commit and push updated source
-          git remote set-url origin "https://SilverLABS:$GITEA_TOKEN@git.silverlabs.uk/$GITEA_REPO.git"
-          git config user.name "Codemagic"
-          git config user.email "ci@silverlabs.uk"
-          git add altstore-source.json
-          git commit -m "chore(altstore): update source for $TAG" || echo "No changes"
-          git push origin HEAD:main
+          # Update altstore-source.json via Gitea API (avoids git push auth)
+          FILE_SHA=$(curl -sf \
+            -H "Authorization: token $GITEA_TOKEN" \
+            "$GITEA_API/repos/$GITEA_REPO/contents/altstore-source.json" \
+            | jq -r '.sha')
+          CONTENT=$(base64 altstore-source.json | tr -d '\n')
+          curl -sf -X PUT "$GITEA_API/repos/$GITEA_REPO/contents/altstore-source.json" \
+            -H "Authorization: token $GITEA_TOKEN" \
+            -H "Content-Type: application/json" \
+            -d "{\"message\":\"chore(altstore): update source for $TAG\",\"content\":\"$CONTENT\",\"sha\":\"$FILE_SHA\",\"branch\":\"main\"}"
 
           # Create Gitea release
           RELEASE_ID=$(curl -sf -X POST "$GITEA_API/repos/$GITEA_REPO/releases" \