chore: update charm libraries (#188)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

lib/charms/loki_k8s/v0/loki_push_api.py

@@ -480,7 +480,7 @@ def _alert_rules_error(self, event):
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 25
+LIBPATCH = 26
 
 logger = logging.getLogger(__name__)
 
@@ -2115,7 +2115,21 @@ def _download_and_push_promtail_to_workload(self, promtail_info: dict) -> None:
                - "zipsha": sha256 sum of zip file of promtail binary
                - "binsha": sha256 sum of unpacked promtail binary
         """
-        with request.urlopen(promtail_info["url"]) as r:
+        # Check for Juju proxy variables and fall back to standard ones if not set
+        proxies: Optional[Dict[str, str]] = {}
+        if proxies and os.environ.get("JUJU_CHARM_HTTP_PROXY"):
+            proxies.update({"http": os.environ["JUJU_CHARM_HTTP_PROXY"]})
+        if proxies and os.environ.get("JUJU_CHARM_HTTPS_PROXY"):
+            proxies.update({"https": os.environ["JUJU_CHARM_HTTPS_PROXY"]})
+        if proxies and os.environ.get("JUJU_CHARM_NO_PROXY"):
+            proxies.update({"no_proxy": os.environ["JUJU_CHARM_NO_PROXY"]})
+        else:
+            proxies = None
+
+        proxy_handler = request.ProxyHandler(proxies)
+        opener = request.build_opener(proxy_handler)
+
+        with opener.open(promtail_info["url"]) as r:
             file_bytes = r.read()
             file_path = os.path.join(BINARY_DIR, promtail_info["filename"] + ".gz")
             with open(file_path, "wb") as f: