Add protection to disable Gitea when run as root (#17168)

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: 6543 <6543@obermui.de>

.drone.yml

@@ -207,8 +207,14 @@ steps:
     commands:
       - git update-ref refs/heads/tag_test ${DRONE_COMMIT_SHA}
 
+  - name: fix-permissions
+    image: gitea/test_env:linux-amd64  # https://gitea.com/gitea/test-env
+    commands:
+      - chown -R gitea:gitea .
+
   - name: unit-test
-    image: golang:1.17
+    image: gitea/test_env:linux-amd64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - make unit-test-coverage test-check
     environment:
@@ -220,7 +226,8 @@ steps:
 
   - name: unit-test-gogit
     pull: always
-    image: golang:1.17
+    image: gitea/test_env:linux-amd64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - make unit-test-coverage test-check
     environment:
@@ -232,6 +239,7 @@ steps:
 
   - name: test-mysql
     image: gitea/test_env:linux-amd64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - make test-mysql-migration integration-test-coverage
     environment:
@@ -246,6 +254,7 @@ steps:
 
   - name: test-mysql8
     image: gitea/test_env:linux-amd64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - timeout -s ABRT 40m make test-mysql8-migration test-mysql8
     environment:
@@ -259,6 +268,7 @@ steps:
 
   - name: test-mssql
     image: gitea/test_env:linux-amd64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - make test-mssql-migration test-mssql
     environment:
@@ -343,9 +353,15 @@ steps:
         exclude:
           - pull_request
 
+  - name: fix-permissions
+    image: gitea/test_env:linux-arm64  # https://gitea.com/gitea/test-env
+    commands:
+      - chown -R gitea:gitea .
+
   - name: build
     pull: always
-    image: golang:1.17
+    image: gitea/test_env:linux-arm64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - make backend
     environment:
@@ -355,6 +371,7 @@ steps:
 
   - name: test-sqlite
     image: gitea/test_env:linux-arm64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - timeout -s ABRT 40m make test-sqlite-migration test-sqlite
     environment:
@@ -368,6 +385,7 @@ steps:
 
   - name: test-pgsql
     image: gitea/test_env:linux-arm64  # https://gitea.com/gitea/test-env
+    user: gitea
     commands:
       - timeout -s ABRT 40m make test-pgsql-migration test-pgsql
     environment: