Remove release-snapshot workflow; use release-build for bugbash (#4907)

## Summary
- Remove the `release-snapshot` workflow, which is superseded by the
`release-build` workflow introduced in #4900
- Add `demo-*` and `bugbash-*` branch triggers to `release-build`
(previously only on `release-snapshot`)
- Update the bugbash script to download from `release-build` and extract
platform-specific archives instead of per-platform artifact directories
- The `snapshot` GitHub release is no longer automatically populated on
each push to `main`; it may take a little while for the new workflow's
artifacts to become available

## Test plan
- [x] Pushed a `bugbash-*` branch and confirmed `release-build` triggers
and completes successfully
- [x] Ran the updated bugbash script against the build artifact and
confirmed it works

This pull request was AI-assisted by Isaac.

Author: pietern

.github/workflows/release-build.yml

@@ -6,7 +6,8 @@ on:
       - "v*"
     branches:
       - "main"
-      - "split-release-workflows"
+      - "demo-*"
+      - "bugbash-*"
 
   workflow_dispatch:
 

.github/workflows/release-snapshot.yml

@@ -5,43 +5,39 @@ set -euo pipefail
 # Set the GitHub repository for the Databricks CLI.
 export GH_REPO="databricks/cli"
 
-# Synthesize the directory name for the snapshot build.
-function cli_snapshot_directory() {
-    dir="cli"
+# Synthesize the archive name for the snapshot build.
+function cli_snapshot_archive() {
+    name="databricks_cli"
 
     # Append OS
     case "$(uname -s)" in
     Linux)
-        dir="${dir}_linux"
+        name="${name}_linux"
         ;;
     Darwin)
-        dir="${dir}_darwin"
+        name="${name}_darwin"
         ;;
     *)
-        echo "Unknown operating system: $os"
+        echo "Unknown operating system: $(uname -s)"
+        return 1
         ;;
     esac
 
     # Append architecture
     case "$(uname -m)" in
     x86_64)
-        dir="${dir}_amd64_v1"
-        ;;
-    i386|i686)
-        dir="${dir}_386"
+        name="${name}_amd64"
         ;;
     arm64|aarch64)
-        dir="${dir}_arm64_v8.0"
-        ;;
-    armv7l|armv8l)
-        dir="${dir}_arm_6"
+        name="${name}_arm64"
         ;;
     *)
-        echo "Unknown architecture: $arch"
+        echo "Unknown architecture: $(uname -m)"
+        return 1
         ;;
     esac
 
-    echo $dir
+    echo "${name}.tar.gz"
 }
 
 BRANCH=$1
@@ -72,39 +68,36 @@ echo "Looking for a snapshot build of the Databricks CLI on branch $BRANCH..."
 
 # Find last successful build on $BRANCH.
 last_successful_run_id=$(
-  gh run list -b "$BRANCH" -w release-snapshot --json 'databaseId,conclusion' |
+  gh run list -b "$BRANCH" -w release-build --json 'databaseId,conclusion' |
       jq 'limit(1; .[] | select(.conclusion == "success")) | .databaseId'
 )
 if [ -z "$last_successful_run_id" ]; then
-  echo "Unable to find last successful build of the release-snapshot workflow for branch $BRANCH."
+  echo "Unable to find last successful build of the release-build workflow for branch $BRANCH."
   exit 1
 fi
 
-# Determine artifact name with the right binaries for this runner.
-case "$(uname -s)" in
-Linux)
-    artifact="cli_linux_snapshot"
-    ;;
-Darwin)
-    artifact="cli_darwin_snapshot"
-    ;;
-esac
-
-# Create a temporary directory to download the artifact.
+# Create a temporary directory to download and extract the artifact.
 dir=$(mktemp -d)
 
 # Download the artifact.
 echo "Downloading the snapshot build..."
-gh run download "$last_successful_run_id" -n "$artifact" -D "$dir/.bin"
-dir="$dir/.bin/$(cli_snapshot_directory)"
-if [ ! -d "$dir" ]; then
-    echo "Directory does not exist: $dir"
+gh run download "$last_successful_run_id" -n cli -D "$dir/.download"
+
+# Extract the archive for this platform.
+archive=$(cli_snapshot_archive)
+if [ ! -f "$dir/.download/$archive" ]; then
+    echo "Archive not found: $archive"
+    echo "Available archives:"
+    ls "$dir/.download/"
     exit 1
 fi
 
+mkdir -p "$dir/.bin"
+tar -xzf "$dir/.download/$archive" -C "$dir/.bin"
+
 # Make CLI available on $PATH.
-chmod +x "$dir/databricks"
-export PATH="$dir:$PATH"
+chmod +x "$dir/.bin/databricks"
+export PATH="$dir/.bin:$PATH"
 
 # Set the prompt to indicate the bugbash environment and exec.
 export PS1="(bugbash $BRANCH) \[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ "