[azure-cli]: add bicepVersion for use with installBicep

Add `bicepVersion` parameter (defaulting to `latest`) to optionally
specify a specific Bicep version when `installBicep` is `true`.

Author: Jurjen Oskam

src/azure-cli/devcontainer-feature.json

@@ -1,6 +1,6 @@
 {
   "id": "azure-cli",
-  "version": "1.2.5",
+  "version": "1.2.6",
   "name": "Azure CLI",
   "documentationURL": "https://github.com/devcontainers/features/tree/main/src/azure-cli",
   "description": "Installs the Azure CLI along with needed dependencies. Useful for base Dockerfiles that often are missing required install dependencies like gpg.",
@@ -23,6 +23,14 @@
       "description": "Optionally install Azure Bicep",
       "default": false
     },
+    "bicepVersion": {
+      "type": "string",
+      "proposals": [
+        "latest"
+      ],
+      "default": "latest",
+      "description": "Select or enter a Bicep version. ('latest' or a specic version such as 'v0.31.92')"
+    },
     "installUsingPython": {
       "type": "boolean",
       "description": "Install Azure CLI using Python instead of pipx",

src/azure-cli/install.sh

@@ -15,6 +15,7 @@ rm -rf /var/lib/apt/lists/*
 AZ_VERSION=${VERSION:-"latest"}
 AZ_EXTENSIONS=${EXTENSIONS}
 AZ_INSTALLBICEP=${INSTALLBICEP:-false}
+AZ_BICEPVERSION=${BICEPVERSION:-latest}
 INSTALL_USING_PYTHON=${INSTALLUSINGPYTHON:-false}
 MICROSOFT_GPG_KEYS_URI="https://packages.microsoft.com/keys/microsoft.asc"
 AZCLI_ARCHIVE_ARCHITECTURES="amd64 arm64"
@@ -229,10 +230,16 @@ if [ "${AZ_INSTALLBICEP}" = "true" ]; then
     # The `az bicep install --target-platform` could be a solution; however, linux-arm64 is not an allowed value for this argument yet
     # Manually installing Bicep and moving to the appropriate directory where az expects it to be
 
+    if [ "${AZ_BICEPVERSION}" = "latest" ]; then
+        bicep_download_path="https://github.com/Azure/bicep/releases/latest/download"
+    else
+        bicep_download_path="https://github.com/Azure/bicep/releases/download/${AZ_BICEPVERSION}"
+    fi
+
     if [ "${architecture}" = "arm64" ]; then
-        curl -Lo bicep https://github.com/Azure/bicep/releases/latest/download/bicep-linux-arm64
+        curl -Lo bicep ${bicep_download_path}/bicep-linux-arm64
     else 
-        curl -Lo bicep https://github.com/Azure/bicep/releases/latest/download/bicep-linux-x64
+        curl -Lo bicep ${bicep_download_path}/bicep-linux-x64
     fi
 
     chmod +x ./bicep