Update ghost

[yosifkit]

Changes:

• docker-library/ghost@38f1500: Update to 3.15.0, ghost-cli 1.13.1
• docker-library/ghost@03c59c7: Merge pull request Add initial GitHub Actions CI ghost#218 from docker-library/github-actions
• docker-library/ghost@25ab22f: Add initial GitHub Actions CI

[github-actions]

Diff for f300275:

diff --git a/_bashbrew-list b/_bashbrew-list
index 269c6f7..02547cf 100644
--- a/_bashbrew-list
+++ b/_bashbrew-list
@@ -6,9 +6,9 @@ ghost:2.38.1
 ghost:2.38.1-alpine
 ghost:3
 ghost:3-alpine
-ghost:3.14
-ghost:3.14-alpine
-ghost:3.14.0
-ghost:3.14.0-alpine
+ghost:3.15
+ghost:3.15-alpine
+ghost:3.15.0
+ghost:3.15.0-alpine
 ghost:alpine
 ghost:latest
diff --git a/ghost_alpine/Dockerfile b/ghost_alpine/Dockerfile
index 3206192..e5fa136 100644
--- a/ghost_alpine/Dockerfile
+++ b/ghost_alpine/Dockerfile
@@ -20,7 +20,7 @@ RUN set -eux; \
 ENV GHOST_INSTALL /var/lib/ghost
 ENV GHOST_CONTENT /var/lib/ghost/content
 
-ENV GHOST_VERSION 3.14.0
+ENV GHOST_VERSION 3.15.0
 
 RUN set -eux; \
 	mkdir -p "$GHOST_INSTALL"; \
diff --git a/ghost_latest/Dockerfile b/ghost_latest/Dockerfile
index 761d8bb..8ef7e07 100644
--- a/ghost_latest/Dockerfile
+++ b/ghost_latest/Dockerfile
@@ -44,7 +44,7 @@ RUN set -eux; \
 ENV GHOST_INSTALL /var/lib/ghost
 ENV GHOST_CONTENT /var/lib/ghost/content
 
-ENV GHOST_VERSION 3.14.0
+ENV GHOST_VERSION 3.15.0
 
 RUN set -eux; \
 	mkdir -p "$GHOST_INSTALL"; \