Remove sliding-sync target

.github/workflows/docker.yml

@@ -58,7 +58,6 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           context: .
-          target: sliding-sync
           platforms: ${{ env.PLATFORMS }}
           push: true
           tags: |

.github/workflows/tests.yml

@@ -111,7 +111,7 @@ jobs:
             - name: "Build docker image"
               env:
                 DOCKER_BUILDKIT: 1
-              run: docker build -f Dockerfile --target=sliding-sync -t ghcr.io/matrix-org/sliding-sync-proxy:ci  .
+              run: docker build -f Dockerfile -t ghcr.io/matrix-org/sliding-sync-proxy:ci  .
             - uses: actions/checkout@v2
               with:
                 repository: matrix-org/matrix-react-sdk

Dockerfile

@@ -9,7 +9,7 @@ RUN --mount=target=. \
   GIT_COMMIT=$(git rev-list -1 HEAD) && \
   go build -ldflags "-X main.GitCommit=$GIT_COMMIT" -trimpath -o /out/ ./cmd/syncv3
 
-FROM alpine:3.17 AS sliding-sync
+FROM alpine:3.17
 
 RUN apk --update --no-cache add curl
 COPY --from=base /out/* /usr/bin/