chore(deps): update alpine docker tag to v3.21.2 (#15662)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

clients/cmd/docker-driver/Dockerfile

@@ -11,13 +11,13 @@ WORKDIR /src/loki
 ARG GOARCH
 RUN make clean && make BUILD_IN_CONTAINER=false GOARCH=${GOARCH} clients/cmd/docker-driver/docker-driver
 
-FROM alpine:3.21.1 AS temp
+FROM alpine:3.21.2 AS temp
 
 ARG GOARCH
 
 RUN apk add --update --no-cache --arch=${GOARCH} ca-certificates tzdata
 
-FROM --platform=linux/${GOARCH} alpine:3.21.1
+FROM --platform=linux/${GOARCH} alpine:3.21.2
 
 COPY --from=temp /etc/ca-certificates.conf /etc/ca-certificates.conf
 COPY --from=temp /usr/share/ca-certificates /usr/share/ca-certificates

clients/cmd/promtail/Dockerfile.debug

@@ -9,7 +9,7 @@ WORKDIR /src/loki
 RUN make clean && make BUILD_IN_CONTAINER=false PROMTAIL_JOURNAL_ENABLED=true promtail-debug
 
 
-FROM       alpine:3.21.1
+FROM       alpine:3.21.2
 RUN        apk add --update --no-cache ca-certificates tzdata
 COPY       --from=build /src/loki/clients/cmd/promtail/promtail-debug /usr/bin/promtail-debug
 COPY       --from=build /usr/bin/dlv /usr/bin/dlv

loki-build-image/Dockerfile

@@ -17,7 +17,7 @@ RUN BIN=$([ "$TARGETARCH" = "arm64" ] && echo "helm-docs_Linux_arm64" || echo "h
     curl -L "https://github.com/norwoodj/helm-docs/releases/download/v1.11.2/$BIN.tar.gz" | tar zx && \
     install -t /usr/local/bin helm-docs
 
-FROM alpine:3.21.1 AS lychee
+FROM alpine:3.21.2 AS lychee
 ARG TARGETARCH
 ARG LYCHEE_VER="0.7.0"
 RUN apk add --no-cache curl && \
@@ -26,18 +26,18 @@ RUN apk add --no-cache curl && \
     mv /tmp/lychee /usr/bin/lychee && \
     rm -rf "/tmp/linux-$TARGETARCH" /tmp/lychee-$LYCHEE_VER.tgz
 
-FROM alpine:3.21.1 AS golangci
+FROM alpine:3.21.2 AS golangci
 RUN apk add --no-cache curl && \
     cd / && \
     curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.60.3
 
-FROM alpine:3.21.1 AS buf
+FROM alpine:3.21.2 AS buf
 ARG TARGETOS
 RUN apk add --no-cache curl && \
     curl -sSL "https://github.com/bufbuild/buf/releases/download/v1.4.0/buf-$TARGETOS-$(uname -m)" -o "/usr/bin/buf" && \
     chmod +x "/usr/bin/buf"
 
-FROM alpine:3.21.1 AS docker
+FROM alpine:3.21.2 AS docker
 RUN apk add --no-cache docker-cli docker-cli-buildx
 
 FROM ${GOLANG_BASE_IMAGE} AS drone

tools/dev/loki-tsdb-storage-s3/dev.dockerfile

@@ -2,7 +2,7 @@ FROM golang:1.23
 ENV CGO_ENABLED=0
 RUN go install github.com/go-delve/delve/cmd/dlv@v1.23.1
 
-FROM alpine:3.21.1
+FROM alpine:3.21.2
 
 RUN     mkdir /loki
 WORKDIR /loki