Stop using init and entrypoint scripts (#4830)

## Motivation

The init and entrypoint shell scripts (server-entrypoint.sh,
proxy-entrypoint.sh, etc.) were thin wrappers around binary calls that
passed arguments to the Linera binaries. This meant that any time we
needed to change initialization or entrypoint arguments (e.g., adding
new flags, changing default values), we had to rebuild the Docker
images, which is inefficient and couples configuration to the image
build process.

## Proposal

This PR removes all init and entrypoint shell scripts and embeds their
logic directly into the configuration files:

- **Deleted 7 shell scripts** from the codebase:
  - `docker/server-entrypoint.sh`, `docker/server-init.sh`
  - `docker/proxy-entrypoint.sh`, `docker/proxy-init.sh`
- `docker/compose-server-entrypoint.sh`,
`docker/compose-proxy-entrypoint.sh`, `docker/compose-server-init.sh`

- **Updated Kubernetes templates** (shards.yaml and proxy.yaml):
- Replaced script calls with inline shell commands in both
initContainers and main containers
  - All binary arguments are now specified directly in the YAML

- **Updated Docker Compose** (docker-compose.yml):
- Replaced script calls with direct binary invocations using command
arrays
  - Init logic is now inline shell script in the shard-init service

- **Updated Dockerfile**:
  - Removed COPY commands for all deleted scripts

**Benefits:**
- Binary configuration changes (flags, environment variables) no longer
require Docker image rebuilds
- Arguments are visible directly in the deployment configs
- Simpler deployment pipeline - fewer moving parts
- Easier to understand what arguments are being passed to binaries

## Test Plan

- Verified all shell scripts are deleted from the repository
- Verified Dockerfile no longer references the deleted scripts
- Checked that Kubernetes YAML templates have valid syntax
- Checked that Docker Compose YAML has valid syntax
- All binary arguments are correctly passed via command-line flags in
the configs

## Release Plan

- These changes should be backported to the latest `testnet` branch,
then be released in a validator hotfix.

Author: ndr-ds

docker/Dockerfile

@@ -119,13 +119,3 @@ COPY --from=binaries \
     linera-server \
     linera-proxy \
     ./
-
-COPY --chmod=755 \
-    docker/server-entrypoint.sh \
-    docker/server-init.sh \
-    docker/proxy-entrypoint.sh \
-    docker/proxy-init.sh \
-    docker/compose-server-entrypoint.sh \
-    docker/compose-proxy-entrypoint.sh \
-    docker/compose-server-init.sh \
-    ./

docker/compose-proxy-entrypoint.sh

@@ -47,7 +47,13 @@ services:
     container_name: proxy
     ports:
       - "19100:19100"
-    command: ["./compose-proxy-entrypoint.sh", "1"]
+    command:
+      - ./linera-proxy
+      - --storage
+      - scylladb:tcp:scylla:9042
+      - --storage-replication-factor
+      - "1"
+      - /config/server.json
     volumes:
       - .:/config
     labels:
@@ -60,7 +66,17 @@ services:
     image: "${LINERA_IMAGE:-us-docker.pkg.dev/linera-io-dev/linera-public-registry/linera:testnet_conway_release}"
     deploy:
       replicas: 4
-    command: ["./compose-server-entrypoint.sh", "scylladb:tcp:scylla:9042", "1"]
+    command:
+      - ./linera-server
+      - run
+      - --storage
+      - scylladb:tcp:scylla:9042
+      - --server
+      - /config/server.json
+      - --shard
+      - "0"
+      - --storage-replication-factor
+      - "1"
     volumes:
       - .:/config
     labels:
@@ -72,7 +88,30 @@ services:
   shard-init:
     image: "${LINERA_IMAGE:-us-docker.pkg.dev/linera-io-dev/linera-public-registry/linera:testnet_conway_release}"
     container_name: shard-init
-    command: ["./compose-server-init.sh", "scylladb:tcp:scylla:9042", "1"]
+    command:
+      - sh
+      - -c
+      - |
+        while true; do
+          ./linera storage check-existence --storage scylladb:tcp:scylla:9042
+          status=$$?
+          if [ $$status -eq 0 ]; then
+            echo "Database already exists, no need to initialize."
+            exit 0
+          elif [ $$status -eq 1 ]; then
+            echo "Database does not exist, attempting to initialize..."
+            if ./linera storage initialize --storage scylladb:tcp:scylla:9042 --genesis /config/genesis.json; then
+              echo "Initialization successful."
+              exit 0
+            else
+              echo "Initialization failed, retrying in 5 seconds..."
+              sleep 5
+            fi
+          else
+            echo "An unexpected error occurred (status: $$status), retrying in 5 seconds..."
+            sleep 5
+          fi
+        done
     volumes:
       - .:/config
     depends_on:

docker/compose-server-entrypoint.sh

@@ -55,7 +55,25 @@ spec:
         - name: linera-proxy-initializer
           image: {{ .Values.lineraImage }}
           imagePullPolicy: {{ .Values.lineraImagePullPolicy }}
-          command: ["./proxy-init.sh"]
+          command:
+            - sh
+            - -c
+            - |
+              while true; do
+                ./linera storage check-existence --storage "scylladb:tcp:scylla-client.scylla.svc.cluster.local:9042"
+                status=$?
+                if [ "$status" -eq 0 ]; then
+                  echo "Database already exists, no need to initialize."
+                  exit 0
+                else
+                  if [ "$status" -eq 1 ]; then
+                    echo "Database does not exist, retrying in 5 seconds..."
+                  else
+                    echo "An unexpected error occurred (status: $status), retrying in 5 seconds..."
+                  fi
+                  sleep 5
+                fi
+              done
           env:
             - name: RUST_LOG
               value: {{ .Values.logLevel }}
@@ -72,7 +90,16 @@ spec:
               name: linera-port
             - containerPort: 20100
               name: private-port
-          command: ["./proxy-entrypoint.sh", {{ .Values.storageReplicationFactor | quote }}]
+          command:
+            - sh
+            - -c
+            - |
+              ORDINAL="${HOSTNAME##*-}"
+              exec ./linera-proxy \
+                --storage scylladb:tcp:scylla-client.scylla.svc.cluster.local:9042 \
+                --storage-replication-factor {{ .Values.storageReplicationFactor | quote }} \
+                --id "$ORDINAL" \
+                /config/server.json
           env:
             - name: RUST_LOG
               value: {{ .Values.logLevel }}