Install docker inside container

.gitea/workflows/publish.yaml

@@ -8,6 +8,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
+      - run: sh -c 'curl -sSL https://get.docker.com/ | sh'
       -
         name: Login to Docker Hub
         uses: docker/login-action@v3
@@ -27,6 +28,7 @@ jobs:
         with:
           push: true
           build-args: TOOLCHAIN=stable
+          file: '{context}/rustup/Dockerfile'
           tags: gitea.loadingm.xyz/the10thwiz/rustup:stable,gitea.loadingm.xyz/the10thwiz/rustup:latest
       -
         name: Build and push
@@ -34,6 +36,7 @@ jobs:
         with:
           push: true
           build-args: TOOLCHAIN=beta
+          file: '{context}/rustup/Dockerfile'
           tags: gitea.loadingm.xyz/the10thwiz/rustup:beta
       -
         name: Build and push
@@ -41,4 +44,5 @@ jobs:
         with:
           push: true
           build-args: TOOLCHAIN=nightly
+          file: '{context}/rustup/Dockerfile'
           tags: gitea.loadingm.xyz/the10thwiz/rustup:nightly