[ci] Don't build images in CI

It seems to not be possible to (safely) communicate with a remote builder instance.

.forgejo/workflows/commit.yaml

@@ -1,46 +0,0 @@
-on:
-  push:
-    branches:
-      - 'dev'
-jobs:
-  test-build:
-    runs-on: docker
-    container:
-      image: iceshrimp.dev/iceshrimp/ci-env:latest
-      options: --volume /opt/iceshrimp-cache/yarn:/iceshrimp-caches/yarn
-    services:
-      database:
-        image: postgres:15
-        env:
-          POSTGRES_PASSWORD: "test"
-      redis:
-        image: redis
-    steps:
-      - name: Clone repository
-        run: git clone https://iceshrimp.dev/iceshrimp/iceshrimp.git --branch=${{ github.ref_name }} --depth=1 .
-      - name: Install build dependencies
-        run: |
-          cp -Tr /iceshrimp-caches/yarn .yarn
-          yarn --immutable
-          rm -rf /iceshrimp-caches/yarn/* && cp -Tr .yarn /iceshrimp-caches/yarn
-      - name: Build the shrimp
-        run: yarn build:debug
-      - name: Test the shrimp
-        run: |
-          cp .config/ci.yml .config/default.yml
-          yarn run migrate
-  build-and-push:
-    runs-on: docker
-    needs: test-build
-    container:
-      image: iceshrimp.dev/iceshrimp/ci-env:latest
-      options: --volume /home/zotan/.docker:/root/.docker
-    steps:
-      - name: Clone repository
-        run: git clone https://iceshrimp.dev/iceshrimp/iceshrimp.git --branch=${{ github.ref_name }} --depth=1 .
-      - name: Build docker image
-        shell: bash
-        run: |
-          docker login iceshrimp.dev -u ${{ github.actor }} -p ${{ secrets.REGISTRY_TOKEN }}
-          docker buildx build -t iceshrimp.dev/${GITHUB_REPOSITORY@L}:$GITHUB_REF_NAME --provenance=false --platform=linux/amd64,linux/arm64 --push --builder build-cluster .
-          docker buildx prune --keep-storage 20G --builder build-cluster

.forgejo/workflows/test-build.yaml

@@ -1,7 +1,5 @@
 on:
   push:
-    branches-ignore:
-      - 'dev'
 jobs:
   test-build:
     runs-on: docker