dockerimg: add 'apk add grep'

Claude wants to use lots of grep features that the busybox version lacks.

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/dockerimg/testdata/testcreatedockerfile_python_misery.dockerfile b/dockerimg/testdata/testcreatedockerfile_python_misery.dockerfile
index a3a96ee..3eba1c6 100644
--- a/dockerimg/testdata/testcreatedockerfile_python_misery.dockerfile
+++ b/dockerimg/testdata/testcreatedockerfile_python_misery.dockerfile
@@ -1,6 +1,6 @@
 FROM ghcr.io/astral-sh/uv:python3.11-alpine
 
-RUN apk add bash git make jq sqlite gcc musl-dev linux-headers npm nodejs go github-cli ripgrep fzf python3 curl vim
+RUN apk add bash git make jq sqlite gcc musl-dev linux-headers npm nodejs go github-cli ripgrep fzf python3 curl vim grep
 
 ENV GOTOOLCHAIN=auto
 ENV GOPATH=/go
@@ -18,17 +18,20 @@
 RUN git config --global user.email "$GIT_USER_EMAIL" && \
     git config --global user.name "$GIT_USER_NAME"
 
-LABEL sketch_context="1e26552a9d39a0cdaacc7efdcb4d9dd0f94b2d041bb583c3214f0c02be93c89f"
+LABEL sketch_context="7010851bfbb48df3a934ebc3eeff896d406d5f37c6a04d82a5ccdf403374d055"
 COPY . /app
 
 WORKDIR /app
 RUN if [ -f go.mod ]; then go mod download; fi
 
 RUN apk add go || true
-# Install DVC tool as mentioned in the README
+
+# Install DVC as mentioned in the README
 RUN uv pip install --system dvc || true
 
-# Ensure git is properly configured for DVC
-RUN git config --global init.defaultBranch main || true
+# Make sure Go tools are still installed in this Python-based image
+RUN go install golang.org/x/tools/cmd/goimports@latest || true
+RUN go install golang.org/x/tools/gopls@latest || true
+RUN go install mvdan.cc/gofumpt@latest || true
 
 CMD ["/bin/sketch"]