manager: Remove Stale label if present

The stale label provides an easy way to force CI runs for issues after
changing dependencies.

techtree-manager/Cargo.lock

@@ -1349,6 +1349,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha256",
+ "time",
  "tokio",
  "url",
 ]

techtree-manager/Cargo.toml

@@ -14,5 +14,6 @@ petgraph = "0.8.1"
 serde = { version = "1.0.219", features = ["derive"] }
 serde_json = "1.0.140"
 sha256 = "1.6.0"
+time = "0.3.41"
 tokio = { version = "1.45.0", features = ["full"] }
 url = "2.5.4"

techtree-manager/src/issue.rs

@@ -78,5 +78,42 @@ pub async fn update_bot_comment(
         )
         .await
         .context("Failed to update comment body")?;
+
+    Ok(())
+}
+
+pub async fn remove_stale_label(
+    forgejo: &forgejo_api::Forgejo,
+    meta: &crate::event_meta::RepoMeta,
+    issue_number: u64,
+) -> anyhow::Result<()> {
+    let labels = forgejo
+        .issue_get_labels(&meta.owner, &meta.name, issue_number)
+        .await
+        .context("Failed fetching issue labels")?;
+
+    let stale_label_id = labels
+        .iter()
+        .filter(|l| l.name.as_deref() == Some("Stale"))
+        .next()
+        .map(|l| l.id.unwrap());
+
+    if let Some(stale_label_id) = stale_label_id {
+        log::info!("Removing `Stale` label from issue #{issue_number}...");
+
+        forgejo
+            .issue_remove_label(
+                &meta.owner,
+                &meta.name,
+                issue_number,
+                stale_label_id,
+                forgejo_api::structs::DeleteLabelsOption {
+                    updated_at: Some(time::OffsetDateTime::now_utc()),
+                },
+            )
+            .await
+            .context("Failed to remove the `Stale` label")?;
+    }
+
     Ok(())
 }

techtree-manager/src/main.rs

@@ -99,6 +99,12 @@ async fn run() -> anyhow::Result<()> {
             if let Some(bot_comment) = bot_comment {
                 if bot_comment.body.contains(&hash) {
                     log::info!("Issue #{issue} is up-to-date, not editing comment.");
+                    issue::remove_stale_label(&forgejo, &meta.issue.repository, issue)
+                        .await
+                        .with_context(|| {
+                            format!("Failed to remove `Stale` label from issue #{issue}")
+                        })?;
+
                     continue 'issues;
                 }
                 bot_comment.id
@@ -128,6 +134,10 @@ async fn run() -> anyhow::Result<()> {
         issue::update_bot_comment(&forgejo, &meta.issue.repository, comment_id, full_text)
             .await
             .with_context(|| format!("Failed to update the bot comment in issue #{issue}"))?;
+
+        issue::remove_stale_label(&forgejo, &meta.issue.repository, issue)
+            .await
+            .with_context(|| format!("Failed to remove `Stale` label from issue #{issue}"))?;
     }
 
     Ok(())