docker: simplify apk add lines

The images produced are no longer consumed directly by sourcegraph so we
don't have security scanners running on them. Additionally we upgraded
to the latest alpine now. Both combined means we can simplify the apk
add lines.

Test Plan: built locally

  docker build -t zoekt .
  docker build -t zoekt-indexserver . -f Dockerfile.indexserver
  docker build -t zoekt-webserver   . -f Dockerfile.webserver

Dockerfile

@@ -15,8 +15,7 @@ RUN go install -ldflags "-X github.com/sourcegraph/zoekt.Version=$VERSION" ./cmd
 
 FROM rust:alpine3.19 AS rust-builder
 
-RUN apk update --no-cache && apk upgrade --no-cache && \
-    apk add --no-cache git wget musl-dev>=1.1.24-r10 build-base
+RUN apk add --no-cache git wget musl-dev build-base
 
 RUN wget -qO- https://github.com/sourcegraph/sourcegraph/archive/0c8aa18eece45922a2b56dc0f94e21b1bb533e7d.tar.gz | tar xz && mv sourcegraph-* sourcegraph
 
@@ -29,8 +28,7 @@ RUN cargo install --path sourcegraph/docker-images/syntax-highlighter --root /sy
 
 FROM alpine:3.19 AS zoekt
 
-RUN apk update --no-cache && apk upgrade --no-cache && \
-    apk add --no-cache git ca-certificates bind-tools tini jansson wget
+RUN apk add --no-cache git ca-certificates bind-tools tini jansson wget
 
 COPY install-ctags-alpine.sh .
 RUN ./install-ctags-alpine.sh && rm install-ctags-alpine.sh

Dockerfile.indexserver

@@ -1,8 +1,7 @@
 FROM alpine:3.19
 
-RUN apk update --no-cache && apk upgrade --no-cache && \
-    apk add --no-cache ca-certificates bind-tools tini 'git>=2.38.5-r0' jansson && \
-    apk add --upgrade --no-cache 'libcrypto1.1>=1.1.1n-r0' 'libssl1.1>=1.1.1n-r0' 'pcre2>=10.40-r0' 'e2fsprogs>=1.46.6-r0'
+RUN apk add --no-cache ca-certificates bind-tools tini git jansson
+
 # Run as non-root user sourcegraph. External volumes should be mounted under /data (which will be owned by sourcegraph).
 RUN mkdir -p /home/sourcegraph
 RUN addgroup -S sourcegraph && adduser -S -G sourcegraph -h /home/sourcegraph sourcegraph && mkdir -p /data && chown -R sourcegraph:sourcegraph /data

Dockerfile.webserver

@@ -1,7 +1,6 @@
 FROM alpine:3.19
 
-RUN apk update --no-cache && apk upgrade --no-cache && \
-   apk add --no-cache ca-certificates bind-tools tini
+RUN apk add --no-cache ca-certificates bind-tools tini
 
 # Run as non-root user sourcegraph. External volumes should be mounted under /data (which will be owned by sourcegraph).
 RUN mkdir -p /home/sourcegraph