sccache 0.15.0

Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible. Sccache has the capability to utilize caching in remote storage environments, including various cloud storage options, or alternatively, in local storage.
Documentation 
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// Copyright 2022 Bitski Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use opendal::Operator;
use opendal::layers::{HttpClientLayer, LoggingLayer};
use opendal::services::Ghac;

use crate::VERSION;
use crate::errors::*;

use super::http_client::set_user_agent;

/// A cache that stores entries in GHA Cache Services.
pub struct GHACache;

impl GHACache {
    pub fn build(version: &str) -> Result<Operator> {
        let mut builder = Ghac::default()
            // This is the prefix of gha cache.
            // From user side, cache key will be like `sccache/f/c/b/fcbxxx`
            //
            // User customization is theoretically supported, but I decided
            // to see the community feedback first.
            .root("/sccache");

        builder = if version.is_empty() {
            builder.version(&format!("sccache-v{VERSION}"))
        } else {
            builder.version(&format!("sccache-v{VERSION}-{version}"))
        };

        let op = Operator::new(builder)?
            .layer(HttpClientLayer::new(set_user_agent()))
            .layer(LoggingLayer::default())
            .finish();
        Ok(op)
    }
}